Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1195 insertions, 0 deletions

diff --git a/editor/libeditor/AutoRangeArray.cpp b/editor/libeditor/AutoRangeArray.cpp
new file mode 100644
index 0000000000..bff0806a8d
--- /dev/null
+++ b/editor/libeditor/AutoRangeArray.cpp
@@ -0,0 +1,1195 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "AutoRangeArray.h"
+
+#include "EditorDOMPoint.h"   // for EditorDOMPoint, EditorDOMRange, etc
+#include "EditorForwards.h"   // for CollectChildrenOptions
+#include "HTMLEditUtils.h"    // for HTMLEditUtils
+#include "HTMLEditHelpers.h"  // for SplitNodeResult
+#include "WSRunObject.h"      // for WSRunScanner
+
+#include "mozilla/OwningNonNull.h"      // for OwningNonNull
+#include "mozilla/dom/Document.h"       // for dom::Document
+#include "mozilla/dom/HTMLBRElement.h"  // for dom HTMLBRElement
+#include "mozilla/dom/Selection.h"      // for dom::Selection
+#include "mozilla/dom/Text.h"           // for dom::Text
+
+#include "gfxFontUtils.h"      // for gfxFontUtils
+#include "nsError.h"           // for NS_SUCCESS_* and NS_ERROR_*
+#include "nsFrameSelection.h"  // for nsFrameSelection
+#include "nsIContent.h"        // for nsIContent
+#include "nsINode.h"           // for nsINode
+#include "nsRange.h"           // for nsRange
+#include "nsTextFragment.h"    // for nsTextFragment
+
+namespace mozilla {
+
+using namespace dom;
+
+/******************************************************************************
+ * mozilla::AutoRangeArray
+ *****************************************************************************/
+
+template AutoRangeArray::AutoRangeArray(const EditorDOMRange& aRange);
+template AutoRangeArray::AutoRangeArray(const EditorRawDOMRange& aRange);
+template AutoRangeArray::AutoRangeArray(const EditorDOMPoint& aRange);
+template AutoRangeArray::AutoRangeArray(const EditorRawDOMPoint& aRange);
+
+AutoRangeArray::AutoRangeArray(const dom::Selection& aSelection) {
+  Initialize(aSelection);
+}
+
+AutoRangeArray::AutoRangeArray(const AutoRangeArray& aOther)
+    : mAnchorFocusRange(aOther.mAnchorFocusRange),
+      mDirection(aOther.mDirection) {
+  mRanges.SetCapacity(aOther.mRanges.Length());
+  for (const OwningNonNull<nsRange>& range : aOther.mRanges) {
+    RefPtr<nsRange> clonedRange = range->CloneRange();
+    mRanges.AppendElement(std::move(clonedRange));
+  }
+  mAnchorFocusRange = aOther.mAnchorFocusRange;
+}
+
+template <typename PointType>
+AutoRangeArray::AutoRangeArray(const EditorDOMRangeBase<PointType>& aRange) {
+  MOZ_ASSERT(aRange.IsPositionedAndValid());
+  RefPtr<nsRange> range = aRange.CreateRange(IgnoreErrors());
+  if (NS_WARN_IF(!range) || NS_WARN_IF(!range->IsPositioned())) {
+    return;
+  }
+  mRanges.AppendElement(*range);
+  mAnchorFocusRange = std::move(range);
+}
+
+template <typename PT, typename CT>
+AutoRangeArray::AutoRangeArray(const EditorDOMPointBase<PT, CT>& aPoint) {
+  MOZ_ASSERT(aPoint.IsSetAndValid());
+  RefPtr<nsRange> range = aPoint.CreateCollapsedRange(IgnoreErrors());
+  if (NS_WARN_IF(!range) || NS_WARN_IF(!range->IsPositioned())) {
+    return;
+  }
+  mRanges.AppendElement(*range);
+  mAnchorFocusRange = std::move(range);
+}
+
+AutoRangeArray::~AutoRangeArray() {
+  if (mSavedRanges.isSome()) {
+    ClearSavedRanges();
+  }
+}
+
+// static
+bool AutoRangeArray::IsEditableRange(const dom::AbstractRange& aRange,
+                                     const Element& aEditingHost) {
+  // TODO: Perhaps, we should check whether the start/end boundaries are
+  //       first/last point of non-editable element.
+  //       See https://github.com/w3c/editing/issues/283#issuecomment-788654850
+  EditorRawDOMPoint atStart(aRange.StartRef());
+  const bool isStartEditable =
+      atStart.IsInContentNode() &&
+      EditorUtils::IsEditableContent(*atStart.ContainerAs<nsIContent>(),
+                                     EditorUtils::EditorType::HTML) &&
+      !HTMLEditUtils::IsNonEditableReplacedContent(
+          *atStart.ContainerAs<nsIContent>());
+  if (!isStartEditable) {
+    return false;
+  }
+
+  if (aRange.GetStartContainer() != aRange.GetEndContainer()) {
+    EditorRawDOMPoint atEnd(aRange.EndRef());
+    const bool isEndEditable =
+        atEnd.IsInContentNode() &&
+        EditorUtils::IsEditableContent(*atEnd.ContainerAs<nsIContent>(),
+                                       EditorUtils::EditorType::HTML) &&
+        !HTMLEditUtils::IsNonEditableReplacedContent(
+            *atEnd.ContainerAs<nsIContent>());
+    if (!isEndEditable) {
+      return false;
+    }
+
+    // Now, both start and end points are editable, but if they are in
+    // different editing host, we cannot edit the range.
+    if (atStart.ContainerAs<nsIContent>() != atEnd.ContainerAs<nsIContent>() &&
+        atStart.ContainerAs<nsIContent>()->GetEditingHost() !=
+            atEnd.ContainerAs<nsIContent>()->GetEditingHost()) {
+      return false;
+    }
+  }
+
+  // HTMLEditor does not support modifying outside `<body>` element for now.
+  nsINode* commonAncestor = aRange.GetClosestCommonInclusiveAncestor();
+  return commonAncestor && commonAncestor->IsContent() &&
+         commonAncestor->IsInclusiveDescendantOf(&aEditingHost);
+}
+
+void AutoRangeArray::EnsureOnlyEditableRanges(const Element& aEditingHost) {
+  for (size_t i = mRanges.Length(); i > 0; i--) {
+    const OwningNonNull<nsRange>& range = mRanges[i - 1];
+    if (!AutoRangeArray::IsEditableRange(range, aEditingHost)) {
+      mRanges.RemoveElementAt(i - 1);
+      continue;
+    }
+    // Special handling for `inert` attribute. If anchor node is inert, the
+    // range should be treated as not editable.
+    nsIContent* anchorContent =
+        mDirection == eDirNext
+            ? nsIContent::FromNode(range->GetStartContainer())
+            : nsIContent::FromNode(range->GetEndContainer());
+    if (anchorContent && HTMLEditUtils::ContentIsInert(*anchorContent)) {
+      mRanges.RemoveElementAt(i - 1);
+      continue;
+    }
+    // Additionally, if focus node is inert, the range should be collapsed to
+    // anchor node.
+    nsIContent* focusContent =
+        mDirection == eDirNext
+            ? nsIContent::FromNode(range->GetEndContainer())
+            : nsIContent::FromNode(range->GetStartContainer());
+    if (focusContent && focusContent != anchorContent &&
+        HTMLEditUtils::ContentIsInert(*focusContent)) {
+      range->Collapse(mDirection == eDirNext);
+    }
+  }
+  mAnchorFocusRange = mRanges.IsEmpty() ? nullptr : mRanges.LastElement().get();
+}
+
+void AutoRangeArray::EnsureRangesInTextNode(const Text& aTextNode) {
+  auto GetOffsetInTextNode = [&aTextNode](const nsINode* aNode,
+                                          uint32_t aOffset) -> uint32_t {
+    MOZ_DIAGNOSTIC_ASSERT(aNode);
+    if (aNode == &aTextNode) {
+      return aOffset;
+    }
+    const nsIContent* anonymousDivElement = aTextNode.GetParent();
+    MOZ_DIAGNOSTIC_ASSERT(anonymousDivElement);
+    MOZ_DIAGNOSTIC_ASSERT(anonymousDivElement->IsHTMLElement(nsGkAtoms::div));
+    MOZ_DIAGNOSTIC_ASSERT(anonymousDivElement->GetFirstChild() == &aTextNode);
+    if (aNode == anonymousDivElement && aOffset == 0u) {
+      return 0u;  // Point before the text node so that use start of the text.
+    }
+    MOZ_DIAGNOSTIC_ASSERT(aNode->IsInclusiveDescendantOf(anonymousDivElement));
+    // Point after the text node so that use end of the text.
+    return aTextNode.TextDataLength();
+  };
+  for (uint32_t i : IntegerRange(mRanges.Length())) {
+    const OwningNonNull<nsRange>& range = mRanges[i];
+    if (MOZ_LIKELY(range->GetStartContainer() == &aTextNode &&
+                   range->GetEndContainer() == &aTextNode)) {
+      continue;
+    }
+    range->SetStartAndEnd(
+        const_cast<Text*>(&aTextNode),
+        GetOffsetInTextNode(range->GetStartContainer(), range->StartOffset()),
+        const_cast<Text*>(&aTextNode),
+        GetOffsetInTextNode(range->GetEndContainer(), range->EndOffset()));
+  }
+
+  if (MOZ_UNLIKELY(mRanges.Length() >= 2)) {
+    // For avoiding to handle same things in same range, we should drop and
+    // merge unnecessary ranges.  Note that the ranges never overlap
+    // because selection ranges are not allowed it so that we need to check only
+    // end offset vs start offset of next one.
+    for (uint32_t i : Reversed(IntegerRange(mRanges.Length() - 1u))) {
+      MOZ_ASSERT(mRanges[i]->EndOffset() < mRanges[i + 1]->StartOffset());
+      // XXX Should we delete collapsed range unless the index is 0?  Without
+      //     Selection API, such situation cannot happen so that `TextEditor`
+      //     may behave unexpectedly.
+      if (MOZ_UNLIKELY(mRanges[i]->EndOffset() >=
+                       mRanges[i + 1]->StartOffset())) {
+        const uint32_t newEndOffset = mRanges[i + 1]->EndOffset();
+        mRanges.RemoveElementAt(i + 1);
+        if (MOZ_UNLIKELY(NS_WARN_IF(newEndOffset > mRanges[i]->EndOffset()))) {
+          // So, this case shouldn't happen.
+          mRanges[i]->SetStartAndEnd(
+              const_cast<Text*>(&aTextNode), mRanges[i]->StartOffset(),
+              const_cast<Text*>(&aTextNode), newEndOffset);
+        }
+      }
+    }
+  }
+}
+
+Result<nsIEditor::EDirection, nsresult>
+AutoRangeArray::ExtendAnchorFocusRangeFor(
+    const EditorBase& aEditorBase, nsIEditor::EDirection aDirectionAndAmount) {
+  MOZ_ASSERT(aEditorBase.IsEditActionDataAvailable());
+  MOZ_ASSERT(mAnchorFocusRange);
+  MOZ_ASSERT(mAnchorFocusRange->IsPositioned());
+  MOZ_ASSERT(mAnchorFocusRange->StartRef().IsSet());
+  MOZ_ASSERT(mAnchorFocusRange->EndRef().IsSet());
+
+  if (!EditorUtils::IsFrameSelectionRequiredToExtendSelection(
+          aDirectionAndAmount, *this)) {
+    return aDirectionAndAmount;
+  }
+
+  if (NS_WARN_IF(!aEditorBase.SelectionRef().RangeCount())) {
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  // By a preceding call of EnsureOnlyEditableRanges(), anchor/focus range may
+  // have been changed.  In that case, we cannot use nsFrameSelection anymore.
+  // FIXME: We should make `nsFrameSelection::CreateRangeExtendedToSomewhere`
+  //        work without `Selection` instance.
+  if (MOZ_UNLIKELY(
+          aEditorBase.SelectionRef().GetAnchorFocusRange()->StartRef() !=
+              mAnchorFocusRange->StartRef() ||
+          aEditorBase.SelectionRef().GetAnchorFocusRange()->EndRef() !=
+              mAnchorFocusRange->EndRef())) {
+    return aDirectionAndAmount;
+  }
+
+  RefPtr<nsFrameSelection> frameSelection =
+      aEditorBase.SelectionRef().GetFrameSelection();
+  if (NS_WARN_IF(!frameSelection)) {
+    return Err(NS_ERROR_NOT_INITIALIZED);
+  }
+
+  RefPtr<Element> editingHost;
+  if (aEditorBase.IsHTMLEditor()) {
+    editingHost = aEditorBase.AsHTMLEditor()->ComputeEditingHost();
+    if (!editingHost) {
+      return Err(NS_ERROR_FAILURE);
+    }
+  }
+
+  Result<RefPtr<nsRange>, nsresult> result(NS_ERROR_UNEXPECTED);
+  nsIEditor::EDirection directionAndAmountResult = aDirectionAndAmount;
+  switch (aDirectionAndAmount) {
+    case nsIEditor::eNextWord:
+      result = frameSelection->CreateRangeExtendedToNextWordBoundary<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(
+          result.isOk(),
+          "nsFrameSelection::CreateRangeExtendedToNextWordBoundary() failed");
+      // DeleteSelectionWithTransaction() doesn't handle these actions
+      // because it's inside batching, so don't confuse it:
+      directionAndAmountResult = nsIEditor::eNone;
+      break;
+    case nsIEditor::ePreviousWord:
+      result =
+          frameSelection->CreateRangeExtendedToPreviousWordBoundary<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(
+          result.isOk(),
+          "nsFrameSelection::CreateRangeExtendedToPreviousWordBoundary() "
+          "failed");
+      // DeleteSelectionWithTransaction() doesn't handle these actions
+      // because it's inside batching, so don't confuse it:
+      directionAndAmountResult = nsIEditor::eNone;
+      break;
+    case nsIEditor::eNext:
+      result =
+          frameSelection
+              ->CreateRangeExtendedToNextGraphemeClusterBoundary<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(result.isOk(),
+                           "nsFrameSelection::"
+                           "CreateRangeExtendedToNextGraphemeClusterBoundary() "
+                           "failed");
+      // Don't set directionAndAmount to eNone (see Bug 502259)
+      break;
+    case nsIEditor::ePrevious: {
+      // Only extend the selection where the selection is after a UTF-16
+      // surrogate pair or a variation selector.
+      // For other cases we don't want to do that, in order
+      // to make sure that pressing backspace will only delete the last
+      // typed character.
+      // XXX This is odd if the previous one is a sequence for a grapheme
+      //     cluster.
+      const auto atStartOfSelection = GetFirstRangeStartPoint<EditorDOMPoint>();
+      if (MOZ_UNLIKELY(NS_WARN_IF(!atStartOfSelection.IsSet()))) {
+        return Err(NS_ERROR_FAILURE);
+      }
+
+      // node might be anonymous DIV, so we find better text node
+      const EditorDOMPoint insertionPoint =
+          aEditorBase.FindBetterInsertionPoint(atStartOfSelection);
+      if (MOZ_UNLIKELY(!insertionPoint.IsSet())) {
+        NS_WARNING(
+            "EditorBase::FindBetterInsertionPoint() failed, but ignored");
+        return aDirectionAndAmount;
+      }
+
+      if (!insertionPoint.IsInTextNode()) {
+        return aDirectionAndAmount;
+      }
+
+      const nsTextFragment* data =
+          &insertionPoint.ContainerAs<Text>()->TextFragment();
+      uint32_t offset = insertionPoint.Offset();
+      if (!(offset > 1 &&
+            data->IsLowSurrogateFollowingHighSurrogateAt(offset - 1)) &&
+          !(offset > 0 &&
+            gfxFontUtils::IsVarSelector(data->CharAt(offset - 1)))) {
+        return aDirectionAndAmount;
+      }
+      // Different from the `eNext` case, we look for character boundary.
+      // I'm not sure whether this inconsistency between "Delete" and
+      // "Backspace" is intentional or not.
+      result = frameSelection
+                   ->CreateRangeExtendedToPreviousCharacterBoundary<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(
+          result.isOk(),
+          "nsFrameSelection::"
+          "CreateRangeExtendedToPreviousGraphemeClusterBoundary() failed");
+      break;
+    }
+    case nsIEditor::eToBeginningOfLine:
+      result =
+          frameSelection->CreateRangeExtendedToPreviousHardLineBreak<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(
+          result.isOk(),
+          "nsFrameSelection::CreateRangeExtendedToPreviousHardLineBreak() "
+          "failed");
+      directionAndAmountResult = nsIEditor::eNone;
+      break;
+    case nsIEditor::eToEndOfLine:
+      result =
+          frameSelection->CreateRangeExtendedToNextHardLineBreak<nsRange>();
+      if (NS_WARN_IF(aEditorBase.Destroyed())) {
+        return Err(NS_ERROR_EDITOR_DESTROYED);
+      }
+      NS_WARNING_ASSERTION(
+          result.isOk(),
+          "nsFrameSelection::CreateRangeExtendedToNextHardLineBreak() failed");
+      directionAndAmountResult = nsIEditor::eNext;
+      break;
+    default:
+      return aDirectionAndAmount;
+  }
+
+  if (result.isErr()) {
+    return Err(result.inspectErr());
+  }
+  RefPtr<nsRange> extendedRange(result.unwrap().forget());
+  if (!extendedRange || NS_WARN_IF(!extendedRange->IsPositioned())) {
+    NS_WARNING("Failed to extend the range, but ignored");
+    return directionAndAmountResult;
+  }
+
+  // If the new range isn't editable, keep using the original range.
+  if (aEditorBase.IsHTMLEditor() &&
+      !AutoRangeArray::IsEditableRange(*extendedRange, *editingHost)) {
+    return aDirectionAndAmount;
+  }
+
+  if (NS_WARN_IF(!frameSelection->IsValidSelectionPoint(
+          extendedRange->GetStartContainer())) ||
+      NS_WARN_IF(!frameSelection->IsValidSelectionPoint(
+          extendedRange->GetEndContainer()))) {
+    NS_WARNING("A range was extended to outer of selection limiter");
+    return Err(NS_ERROR_FAILURE);
+  }
+
+  // Swap focus/anchor range with the extended range.
+  DebugOnly<bool> found = false;
+  for (OwningNonNull<nsRange>& range : mRanges) {
+    if (range == mAnchorFocusRange) {
+      range = *extendedRange;
+      found = true;
+      break;
+    }
+  }
+  MOZ_ASSERT(found);
+  mAnchorFocusRange.swap(extendedRange);
+  return directionAndAmountResult;
+}
+
+Result<bool, nsresult>
+AutoRangeArray::ShrinkRangesIfStartFromOrEndAfterAtomicContent(
+    const HTMLEditor& aHTMLEditor, nsIEditor::EDirection aDirectionAndAmount,
+    IfSelectingOnlyOneAtomicContent aIfSelectingOnlyOneAtomicContent,
+    const Element* aEditingHost) {
+  if (IsCollapsed()) {
+    return false;
+  }
+
+  switch (aDirectionAndAmount) {
+    case nsIEditor::eNext:
+    case nsIEditor::eNextWord:
+    case nsIEditor::ePrevious:
+    case nsIEditor::ePreviousWord:
+      break;
+    default:
+      return false;
+  }
+
+  bool changed = false;
+  for (auto& range : mRanges) {
+    MOZ_ASSERT(!range->IsInAnySelection(),
+               "Changing range in selection may cause running script");
+    Result<bool, nsresult> result =
+        WSRunScanner::ShrinkRangeIfStartsFromOrEndsAfterAtomicContent(
+            aHTMLEditor, range, aEditingHost);
+    if (result.isErr()) {
+      NS_WARNING(
+          "WSRunScanner::ShrinkRangeIfStartsFromOrEndsAfterAtomicContent() "
+          "failed");
+      return Err(result.inspectErr());
+    }
+    changed |= result.inspect();
+  }
+
+  if (mRanges.Length() == 1 && aIfSelectingOnlyOneAtomicContent ==
+                                   IfSelectingOnlyOneAtomicContent::Collapse) {
+    MOZ_ASSERT(mRanges[0].get() == mAnchorFocusRange.get());
+    if (mAnchorFocusRange->GetStartContainer() ==
+            mAnchorFocusRange->GetEndContainer() &&
+        mAnchorFocusRange->GetChildAtStartOffset() &&
+        mAnchorFocusRange->StartRef().GetNextSiblingOfChildAtOffset() ==
+            mAnchorFocusRange->GetChildAtEndOffset()) {
+      mAnchorFocusRange->Collapse(aDirectionAndAmount == nsIEditor::eNext ||
+                                  aDirectionAndAmount == nsIEditor::eNextWord);
+      changed = true;
+    }
+  }
+
+  return changed;
+}
+
+bool AutoRangeArray::SaveAndTrackRanges(HTMLEditor& aHTMLEditor) {
+  if (mSavedRanges.isSome()) {
+    return false;
+  }
+  mSavedRanges.emplace(*this);
+  aHTMLEditor.RangeUpdaterRef().RegisterSelectionState(mSavedRanges.ref());
+  mTrackingHTMLEditor = &aHTMLEditor;
+  return true;
+}
+
+void AutoRangeArray::ClearSavedRanges() {
+  if (mSavedRanges.isNothing()) {
+    return;
+  }
+  OwningNonNull<HTMLEditor> htmlEditor(std::move(mTrackingHTMLEditor));
+  MOZ_ASSERT(!mTrackingHTMLEditor);
+  htmlEditor->RangeUpdaterRef().DropSelectionState(mSavedRanges.ref());
+  mSavedRanges.reset();
+}
+
+// static
+void AutoRangeArray::
+    UpdatePointsToSelectAllChildrenIfCollapsedInEmptyBlockElement(
+        EditorDOMPoint& aStartPoint, EditorDOMPoint& aEndPoint,
+        const Element& aEditingHost) {
+  // FYI: This was moved from
+  // https://searchfox.org/mozilla-central/rev/3419858c997f422e3e70020a46baae7f0ec6dacc/editor/libeditor/HTMLEditSubActionHandler.cpp#6743
+
+  // MOOSE major hack:
+  // The GetPointAtFirstContentOfLineOrParentBlockIfFirstContentOfBlock() and
+  // GetPointAfterFollowingLineBreakOrAtFollowingBlock() don't really do the
+  // right thing for collapsed ranges inside block elements that contain nothing
+  // but a solo <br>.  It's easier/ to put a workaround here than to revamp
+  // them.  :-(
+  if (aStartPoint != aEndPoint) {
+    return;
+  }
+
+  if (!aStartPoint.IsInContentNode()) {
+    return;
+  }
+
+  // XXX Perhaps, this should be more careful.  This may not select only one
+  //     node because this just check whether the block is empty or not,
+  //     and may not select in non-editable block.  However, for inline
+  //     editing host case, it's right to look for block element without
+  //     editable state check.  Now, this method is used for preparation for
+  //     other things.  So, cannot write test for this method behavior.
+  //     So, perhaps, we should get rid of this method and each caller should
+  //     handle its job better.
+  Element* const maybeNonEditableBlockElement =
+      HTMLEditUtils::GetInclusiveAncestorElement(
+          *aStartPoint.ContainerAs<nsIContent>(),
+          HTMLEditUtils::ClosestBlockElement);
+  if (!maybeNonEditableBlockElement) {
+    return;
+  }
+
+  // Make sure we don't go higher than our root element in the content tree
+  if (aEditingHost.IsInclusiveDescendantOf(maybeNonEditableBlockElement)) {
+    return;
+  }
+
+  if (HTMLEditUtils::IsEmptyNode(*maybeNonEditableBlockElement)) {
+    aStartPoint.Set(maybeNonEditableBlockElement, 0u);
+    aEndPoint.SetToEndOf(maybeNonEditableBlockElement);
+  }
+}
+
+/**
+ * Get the point before the line containing aPointInLine.
+ *
+ * @return              If the line starts after a `<br>` element, returns next
+ *                      sibling of the `<br>` element.
+ *                      If the line is first line of a block, returns point of
+ *                      the block.
+ * NOTE: The result may be point of editing host.  I.e., the container may be
+ *       outside of editing host.
+ */
+static EditorDOMPoint
+GetPointAtFirstContentOfLineOrParentBlockIfFirstContentOfBlock(
+    const EditorDOMPoint& aPointInLine, EditSubAction aEditSubAction,
+    const Element& aEditingHost) {
+  // FYI: This was moved from
+  // https://searchfox.org/mozilla-central/rev/3419858c997f422e3e70020a46baae7f0ec6dacc/editor/libeditor/HTMLEditSubActionHandler.cpp#6447
+
+  if (NS_WARN_IF(!aPointInLine.IsSet())) {
+    return EditorDOMPoint();
+  }
+
+  EditorDOMPoint point(aPointInLine);
+  // Start scanning from the container node if aPoint is in a text node.
+  // XXX Perhaps, IsInDataNode() must be expected.
+  if (point.IsInTextNode()) {
+    if (!point.GetContainer()->GetParentNode()) {
+      // Okay, can't promote any further
+      // XXX Why don't we return start of the text node?
+      return point;
+    }
+    // If there is a preformatted linefeed in the text node, let's return
+    // the point after it.
+    EditorDOMPoint atLastPreformattedNewLine =
+        HTMLEditUtils::GetPreviousPreformattedNewLineInTextNode<EditorDOMPoint>(
+            point);
+    if (atLastPreformattedNewLine.IsSet()) {
+      return atLastPreformattedNewLine.NextPoint();
+    }
+    point.Set(point.GetContainer());
+  }
+
+  // Look back through any further inline nodes that aren't across a <br>
+  // from us, and that are enclosed in the same block.
+  // I.e., looking for start of current hard line.
+  constexpr HTMLEditUtils::WalkTreeOptions
+      ignoreNonEditableNodeAndStopAtBlockBoundary{
+          HTMLEditUtils::WalkTreeOption::IgnoreNonEditableNode,
+          HTMLEditUtils::WalkTreeOption::StopAtBlockBoundary};
+  for (nsIContent* previousEditableContent = HTMLEditUtils::GetPreviousContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost);
+       previousEditableContent && previousEditableContent->GetParentNode() &&
+       !HTMLEditUtils::IsVisibleBRElement(*previousEditableContent) &&
+       !HTMLEditUtils::IsBlockElement(*previousEditableContent);
+       previousEditableContent = HTMLEditUtils::GetPreviousContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost)) {
+    EditorDOMPoint atLastPreformattedNewLine =
+        HTMLEditUtils::GetPreviousPreformattedNewLineInTextNode<EditorDOMPoint>(
+            EditorRawDOMPoint::AtEndOf(*previousEditableContent));
+    if (atLastPreformattedNewLine.IsSet()) {
+      return atLastPreformattedNewLine.NextPoint();
+    }
+    point.Set(previousEditableContent);
+  }
+
+  // Finding the real start for this point unless current line starts after
+  // <br> element.  Look up the tree for as long as we are the first node in
+  // the container (typically, start of nearest block ancestor), and as long
+  // as we haven't hit the body node.
+  for (nsIContent* nearContent = HTMLEditUtils::GetPreviousContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost);
+       !nearContent && !point.IsContainerHTMLElement(nsGkAtoms::body) &&
+       point.GetContainerParent();
+       nearContent = HTMLEditUtils::GetPreviousContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost)) {
+    // Don't keep looking up if we have found a blockquote element to act on
+    // when we handle outdent.
+    // XXX Sounds like this is hacky.  If possible, it should be check in
+    //     outdent handler for consistency between edit sub-actions.
+    //     We should check Chromium's behavior of outdent when Selection
+    //     starts from `<blockquote>` and starts from first child of
+    //     `<blockquote>`.
+    if (aEditSubAction == EditSubAction::eOutdent &&
+        point.IsContainerHTMLElement(nsGkAtoms::blockquote)) {
+      break;
+    }
+
+    // Don't walk past the editable section. Note that we need to check
+    // before walking up to a parent because we need to return the parent
+    // object, so the parent itself might not be in the editable area, but
+    // it's OK if we're not performing a block-level action.
+    bool blockLevelAction =
+        aEditSubAction == EditSubAction::eIndent ||
+        aEditSubAction == EditSubAction::eOutdent ||
+        aEditSubAction == EditSubAction::eSetOrClearAlignment ||
+        aEditSubAction == EditSubAction::eCreateOrRemoveBlock;
+    // XXX So, does this check whether the container is removable or not? It
+    //     seems that here can be rewritten as obviously what here tries to
+    //     check.
+    if (!point.GetContainerParent()->IsInclusiveDescendantOf(&aEditingHost) &&
+        (blockLevelAction ||
+         !point.GetContainer()->IsInclusiveDescendantOf(&aEditingHost))) {
+      break;
+    }
+
+    point.Set(point.GetContainer());
+  }
+  return point;
+}
+
+/**
+ * Get the point after the following line break or the block which breaks the
+ * line containing aPointInLine.
+ *
+ * @return              If the line ends with a visible `<br>` element, returns
+ *                      the point after the `<br>` element.
+ *                      If the line ends with a preformatted linefeed, returns
+ *                      the point after the linefeed unless it's an invisible
+ *                      line break immediately before a block boundary.
+ *                      If the line ends with a block boundary, returns the
+ *                      point of the block.
+ */
+static EditorDOMPoint GetPointAfterFollowingLineBreakOrAtFollowingBlock(
+    const EditorDOMPoint& aPointInLine, const Element& aEditingHost) {
+  // FYI: This was moved from
+  // https://searchfox.org/mozilla-central/rev/3419858c997f422e3e70020a46baae7f0ec6dacc/editor/libeditor/HTMLEditSubActionHandler.cpp#6541
+
+  if (NS_WARN_IF(!aPointInLine.IsSet())) {
+    return EditorDOMPoint();
+  }
+
+  EditorDOMPoint point(aPointInLine);
+  // Start scanning from the container node if aPoint is in a text node.
+  // XXX Perhaps, IsInDataNode() must be expected.
+  if (point.IsInTextNode()) {
+    if (NS_WARN_IF(!point.GetContainer()->GetParentNode())) {
+      // Okay, can't promote any further
+      // XXX Why don't we return end of the text node?
+      return point;
+    }
+    EditorDOMPoint atNextPreformattedNewLine =
+        HTMLEditUtils::GetInclusiveNextPreformattedNewLineInTextNode<
+            EditorDOMPoint>(point);
+    if (atNextPreformattedNewLine.IsSet()) {
+      // If the linefeed is last character of the text node, it may be
+      // invisible if it's immediately before a block boundary.  In such
+      // case, we should retrun the block boundary.
+      Element* maybeNonEditableBlockElement = nullptr;
+      if (HTMLEditUtils::IsInvisiblePreformattedNewLine(
+              atNextPreformattedNewLine, &maybeNonEditableBlockElement) &&
+          maybeNonEditableBlockElement) {
+        // If the block is a parent of the editing host, let's return end
+        // of editing host.
+        if (maybeNonEditableBlockElement == &aEditingHost ||
+            !maybeNonEditableBlockElement->IsInclusiveDescendantOf(
+                &aEditingHost)) {
+          return EditorDOMPoint::AtEndOf(*maybeNonEditableBlockElement);
+        }
+        // If it's invisible because of parent block boundary, return end
+        // of the block.  Otherwise, i.e., it's followed by a child block,
+        // returns the point of the child block.
+        if (atNextPreformattedNewLine.ContainerAs<Text>()
+                ->IsInclusiveDescendantOf(maybeNonEditableBlockElement)) {
+          return EditorDOMPoint::AtEndOf(*maybeNonEditableBlockElement);
+        }
+        return EditorDOMPoint(maybeNonEditableBlockElement);
+      }
+      // Otherwise, return the point after the preformatted linefeed.
+      return atNextPreformattedNewLine.NextPoint();
+    }
+    // want to be after the text node
+    point.SetAfter(point.GetContainer());
+    NS_WARNING_ASSERTION(point.IsSet(), "Failed to set to after the text node");
+  }
+
+  // Look ahead through any further inline nodes that aren't across a <br> from
+  // us, and that are enclosed in the same block.
+  // XXX Currently, we stop block-extending when finding visible <br> element.
+  //     This might be different from "block-extend" of execCommand spec.
+  //     However, the spec is really unclear.
+  // XXX Probably, scanning only editable nodes is wrong for
+  //     EditSubAction::eCreateOrRemoveBlock because it might be better to wrap
+  //     existing inline elements even if it's non-editable.  For example,
+  //     following examples with insertParagraph causes different result:
+  //     * <div contenteditable>foo[]<b contenteditable="false">bar</b></div>
+  //     * <div contenteditable>foo[]<b>bar</b></div>
+  //     * <div contenteditable>foo[]<b contenteditable="false">bar</b>baz</div>
+  //     Only in the first case, after the caret position isn't wrapped with
+  //     new <div> element.
+  constexpr HTMLEditUtils::WalkTreeOptions
+      ignoreNonEditableNodeAndStopAtBlockBoundary{
+          HTMLEditUtils::WalkTreeOption::IgnoreNonEditableNode,
+          HTMLEditUtils::WalkTreeOption::StopAtBlockBoundary};
+  for (nsIContent* nextEditableContent = HTMLEditUtils::GetNextContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost);
+       nextEditableContent &&
+       !HTMLEditUtils::IsBlockElement(*nextEditableContent) &&
+       nextEditableContent->GetParent();
+       nextEditableContent = HTMLEditUtils::GetNextContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost)) {
+    EditorDOMPoint atFirstPreformattedNewLine =
+        HTMLEditUtils::GetInclusiveNextPreformattedNewLineInTextNode<
+            EditorDOMPoint>(EditorRawDOMPoint(nextEditableContent, 0));
+    if (atFirstPreformattedNewLine.IsSet()) {
+      // If the linefeed is last character of the text node, it may be
+      // invisible if it's immediately before a block boundary.  In such
+      // case, we should retrun the block boundary.
+      Element* maybeNonEditableBlockElement = nullptr;
+      if (HTMLEditUtils::IsInvisiblePreformattedNewLine(
+              atFirstPreformattedNewLine, &maybeNonEditableBlockElement) &&
+          maybeNonEditableBlockElement) {
+        // If the block is a parent of the editing host, let's return end
+        // of editing host.
+        if (maybeNonEditableBlockElement == &aEditingHost ||
+            !maybeNonEditableBlockElement->IsInclusiveDescendantOf(
+                &aEditingHost)) {
+          return EditorDOMPoint::AtEndOf(*maybeNonEditableBlockElement);
+        }
+        // If it's invisible because of parent block boundary, return end
+        // of the block.  Otherwise, i.e., it's followed by a child block,
+        // returns the point of the child block.
+        if (atFirstPreformattedNewLine.ContainerAs<Text>()
+                ->IsInclusiveDescendantOf(maybeNonEditableBlockElement)) {
+          return EditorDOMPoint::AtEndOf(*maybeNonEditableBlockElement);
+        }
+        return EditorDOMPoint(maybeNonEditableBlockElement);
+      }
+      // Otherwise, return the point after the preformatted linefeed.
+      return atFirstPreformattedNewLine.NextPoint();
+    }
+    point.SetAfter(nextEditableContent);
+    if (NS_WARN_IF(!point.IsSet())) {
+      break;
+    }
+    if (HTMLEditUtils::IsVisibleBRElement(*nextEditableContent)) {
+      break;
+    }
+  }
+
+  // Finding the real end for this point unless current line ends with a <br>
+  // element.  Look up the tree for as long as we are the last node in the
+  // container (typically, block node), and as long as we haven't hit the body
+  // node.
+  for (nsIContent* nearContent = HTMLEditUtils::GetNextContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost);
+       !nearContent && !point.IsContainerHTMLElement(nsGkAtoms::body) &&
+       point.GetContainerParent();
+       nearContent = HTMLEditUtils::GetNextContent(
+           point, ignoreNonEditableNodeAndStopAtBlockBoundary, &aEditingHost)) {
+    // Don't walk past the editable section. Note that we need to check before
+    // walking up to a parent because we need to return the parent object, so
+    // the parent itself might not be in the editable area, but it's OK.
+    // XXX Maybe returning parent of editing host is really error prone since
+    //     everybody need to check whether the end point is in editing host
+    //     when they touch there.
+    if (!point.GetContainer()->IsInclusiveDescendantOf(&aEditingHost) &&
+        !point.GetContainerParent()->IsInclusiveDescendantOf(&aEditingHost)) {
+      break;
+    }
+
+    point.SetAfter(point.GetContainer());
+    if (NS_WARN_IF(!point.IsSet())) {
+      break;
+    }
+  }
+  return point;
+}
+
+void AutoRangeArray::ExtendRangesToWrapLinesToHandleBlockLevelEditAction(
+    EditSubAction aEditSubAction, const Element& aEditingHost) {
+  // FYI: This is originated in
+  // https://searchfox.org/mozilla-central/rev/1739f1301d658c9bff544a0a095ab11fca2e549d/editor/libeditor/HTMLEditSubActionHandler.cpp#6712
+
+  bool removeSomeRanges = false;
+  for (OwningNonNull<nsRange>& range : mRanges) {
+    // Remove non-positioned ranges.
+    if (MOZ_UNLIKELY(!range->IsPositioned())) {
+      removeSomeRanges = true;
+      continue;
+    }
+    // If the range is native anonymous subtrees, we must meet a bug of
+    // `Selection` so that we need to hack here.
+    if (MOZ_UNLIKELY(range->GetStartContainer()->IsInNativeAnonymousSubtree() ||
+                     range->GetEndContainer()->IsInNativeAnonymousSubtree())) {
+      EditorRawDOMRange rawRange(range);
+      if (!rawRange.EnsureNotInNativeAnonymousSubtree()) {
+        range->Reset();
+        removeSomeRanges = true;
+        continue;
+      }
+      if (NS_FAILED(
+              range->SetStartAndEnd(rawRange.StartRef().ToRawRangeBoundary(),
+                                    rawRange.EndRef().ToRawRangeBoundary())) ||
+          MOZ_UNLIKELY(!range->IsPositioned())) {
+        range->Reset();
+        removeSomeRanges = true;
+        continue;
+      }
+    }
+    // Finally, extend the range.
+    if (NS_FAILED(ExtendRangeToWrapStartAndEndLinesContainingBoundaries(
+            range, aEditSubAction, aEditingHost))) {
+      // If we failed to extend the range, we should use the original range
+      // as-is unless the range is broken at setting the range.
+      if (NS_WARN_IF(!range->IsPositioned())) {
+        removeSomeRanges = true;
+      }
+    }
+  }
+  if (removeSomeRanges) {
+    for (size_t i : Reversed(IntegerRange(mRanges.Length()))) {
+      if (!mRanges[i]->IsPositioned()) {
+        mRanges.RemoveElementAt(i);
+      }
+    }
+    if (!mAnchorFocusRange || !mAnchorFocusRange->IsPositioned()) {
+      if (mRanges.IsEmpty()) {
+        mAnchorFocusRange = nullptr;
+      } else {
+        mAnchorFocusRange = mRanges.LastElement();
+      }
+    }
+  }
+}
+
+// static
+nsresult AutoRangeArray::ExtendRangeToWrapStartAndEndLinesContainingBoundaries(
+    nsRange& aRange, EditSubAction aEditSubAction,
+    const Element& aEditingHost) {
+  MOZ_DIAGNOSTIC_ASSERT(
+      !EditorRawDOMPoint(aRange.StartRef()).IsInNativeAnonymousSubtree());
+  MOZ_DIAGNOSTIC_ASSERT(
+      !EditorRawDOMPoint(aRange.EndRef()).IsInNativeAnonymousSubtree());
+
+  if (NS_WARN_IF(!aRange.IsPositioned())) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  EditorDOMPoint startPoint(aRange.StartRef()), endPoint(aRange.EndRef());
+  AutoRangeArray::UpdatePointsToSelectAllChildrenIfCollapsedInEmptyBlockElement(
+      startPoint, endPoint, aEditingHost);
+
+  // Make a new adjusted range to represent the appropriate block content.
+  // This is tricky.  The basic idea is to push out the range endpoints to
+  // truly enclose the blocks that we will affect.
+
+  // Make sure that the new range ends up to be in the editable section.
+  // XXX Looks like that this check wastes the time.  Perhaps, we should
+  //     implement a method which checks both two DOM points in the editor
+  //     root.
+
+  startPoint = GetPointAtFirstContentOfLineOrParentBlockIfFirstContentOfBlock(
+      startPoint, aEditSubAction, aEditingHost);
+  // XXX GetPointAtFirstContentOfLineOrParentBlockIfFirstContentOfBlock() may
+  //     return point of editing host.  Perhaps, we should change it and stop
+  //     checking it here since this check may be expensive.
+  // XXX If the container is an element in the editing host but it points end of
+  //     the container, this returns nullptr.  Is it intentional?
+  if (!startPoint.GetChildOrContainerIfDataNode() ||
+      !startPoint.GetChildOrContainerIfDataNode()->IsInclusiveDescendantOf(
+          &aEditingHost)) {
+    return NS_ERROR_FAILURE;
+  }
+  endPoint =
+      GetPointAfterFollowingLineBreakOrAtFollowingBlock(endPoint, aEditingHost);
+  const EditorDOMPoint lastRawPoint =
+      endPoint.IsStartOfContainer() ? endPoint : endPoint.PreviousPoint();
+  // XXX GetPointAfterFollowingLineBreakOrAtFollowingBlock() may return point of
+  //     editing host.  Perhaps, we should change it and stop checking it here
+  //     since this check may be expensive.
+  // XXX If the container is an element in the editing host but it points end of
+  //     the container, this returns nullptr.  Is it intentional?
+  if (!lastRawPoint.GetChildOrContainerIfDataNode() ||
+      !lastRawPoint.GetChildOrContainerIfDataNode()->IsInclusiveDescendantOf(
+          &aEditingHost)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsresult rv = aRange.SetStartAndEnd(startPoint.ToRawRangeBoundary(),
+                                      endPoint.ToRawRangeBoundary());
+  if (NS_FAILED(rv)) {
+    return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+Result<EditorDOMPoint, nsresult>
+AutoRangeArray::SplitTextAtEndBoundariesAndInlineAncestorsAtBothBoundaries(
+    HTMLEditor& aHTMLEditor, const Element& aEditingHost,
+    const nsIContent* aAncestorLimiter /* = nullptr */) {
+  // FYI: The following code is originated in
+  // https://searchfox.org/mozilla-central/rev/c8e15e17bc6fd28f558c395c948a6251b38774ff/editor/libeditor/HTMLEditSubActionHandler.cpp#6971
+
+  // Split text nodes. This is necessary, since given ranges may end in text
+  // nodes in case where part of a pre-formatted elements needs to be moved.
+  EditorDOMPoint pointToPutCaret;
+  IgnoredErrorResult ignoredError;
+  for (const OwningNonNull<nsRange>& range : mRanges) {
+    EditorDOMPoint atEnd(range->EndRef());
+    if (NS_WARN_IF(!atEnd.IsSet()) || !atEnd.IsInTextNode() ||
+        atEnd.GetContainer() == aAncestorLimiter) {
+      continue;
+    }
+
+    if (!atEnd.IsStartOfContainer() && !atEnd.IsEndOfContainer()) {
+      // Split the text node.
+      Result<SplitNodeResult, nsresult> splitAtEndResult =
+          aHTMLEditor.SplitNodeWithTransaction(atEnd);
+      if (MOZ_UNLIKELY(splitAtEndResult.isErr())) {
+        NS_WARNING("HTMLEditor::SplitNodeWithTransaction() failed");
+        return splitAtEndResult.propagateErr();
+      }
+      SplitNodeResult unwrappedSplitAtEndResult = splitAtEndResult.unwrap();
+      unwrappedSplitAtEndResult.MoveCaretPointTo(
+          pointToPutCaret, {SuggestCaret::OnlyIfHasSuggestion});
+
+      // Correct the range.
+      // The new end parent becomes the parent node of the text.
+      MOZ_ASSERT(!range->IsInAnySelection());
+      range->SetEnd(unwrappedSplitAtEndResult.AtNextContent<EditorRawDOMPoint>()
+                        .ToRawRangeBoundary(),
+                    ignoredError);
+      NS_WARNING_ASSERTION(!ignoredError.Failed(),
+                           "nsRange::SetEnd() failed, but ignored");
+      ignoredError.SuppressException();
+    }
+  }
+
+  // FYI: The following code is originated in
+  // https://searchfox.org/mozilla-central/rev/c8e15e17bc6fd28f558c395c948a6251b38774ff/editor/libeditor/HTMLEditSubActionHandler.cpp#7023
+  AutoTArray<OwningNonNull<RangeItem>, 8> rangeItemArray;
+  rangeItemArray.AppendElements(mRanges.Length());
+
+  // First register ranges for special editor gravity
+  Maybe<size_t> anchorFocusRangeIndex;
+  for (size_t index : IntegerRange(rangeItemArray.Length())) {
+    rangeItemArray[index] = new RangeItem();
+    rangeItemArray[index]->StoreRange(*mRanges[index]);
+    aHTMLEditor.RangeUpdaterRef().RegisterRangeItem(*rangeItemArray[index]);
+    if (mRanges[index] == mAnchorFocusRange) {
+      anchorFocusRangeIndex = Some(index);
+    }
+  }
+  // TODO: We should keep the array, and just update the ranges.
+  mRanges.Clear();
+  mAnchorFocusRange = nullptr;
+  // Now bust up inlines.
+  nsresult rv = NS_OK;
+  for (OwningNonNull<RangeItem>& item : Reversed(rangeItemArray)) {
+    // MOZ_KnownLive because 'rangeItemArray' is guaranteed to keep it alive.
+    Result<EditorDOMPoint, nsresult> splitParentsResult =
+        aHTMLEditor.SplitParentInlineElementsAtRangeBoundaries(
+            MOZ_KnownLive(*item), aEditingHost, aAncestorLimiter);
+    if (MOZ_UNLIKELY(splitParentsResult.isErr())) {
+      NS_WARNING(
+          "HTMLEditor::SplitParentInlineElementsAtRangeBoundaries() failed");
+      rv = splitParentsResult.unwrapErr();
+      break;
+    }
+    if (splitParentsResult.inspect().IsSet()) {
+      pointToPutCaret = splitParentsResult.unwrap();
+    }
+  }
+  // Then unregister the ranges
+  for (size_t index : IntegerRange(rangeItemArray.Length())) {
+    aHTMLEditor.RangeUpdaterRef().DropRangeItem(rangeItemArray[index]);
+    RefPtr<nsRange> range = rangeItemArray[index]->GetRange();
+    if (range && range->IsPositioned()) {
+      if (anchorFocusRangeIndex.isSome() && index == *anchorFocusRangeIndex) {
+        mAnchorFocusRange = range;
+      }
+      mRanges.AppendElement(std::move(range));
+    }
+  }
+  if (!mAnchorFocusRange && !mRanges.IsEmpty()) {
+    mAnchorFocusRange = mRanges.LastElement();
+  }
+
+  // XXX Why do we ignore the other errors here??
+  if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
+    return Err(NS_ERROR_EDITOR_DESTROYED);
+  }
+  return pointToPutCaret;
+}
+
+nsresult AutoRangeArray::CollectEditTargetNodes(
+    const HTMLEditor& aHTMLEditor,
+    nsTArray<OwningNonNull<nsIContent>>& aOutArrayOfContents,
+    EditSubAction aEditSubAction,
+    CollectNonEditableNodes aCollectNonEditableNodes) const {
+  MOZ_ASSERT(aHTMLEditor.IsEditActionDataAvailable());
+
+  // FYI: This was moved from
+  // https://searchfox.org/mozilla-central/rev/4bce7d85ba4796dd03c5dcc7cfe8eee0e4c07b3b/editor/libeditor/HTMLEditSubActionHandler.cpp#7060
+
+  // Gather up a list of all the nodes
+  for (const OwningNonNull<nsRange>& range : mRanges) {
+    DOMSubtreeIterator iter;
+    nsresult rv = iter.Init(*range);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("DOMSubtreeIterator::Init() failed");
+      return rv;
+    }
+    if (aOutArrayOfContents.IsEmpty()) {
+      iter.AppendAllNodesToArray(aOutArrayOfContents);
+    } else {
+      AutoTArray<OwningNonNull<nsIContent>, 24> arrayOfTopChildren;
+      iter.AppendNodesToArray(
+          +[](nsINode& aNode, void* aArray) -> bool {
+            MOZ_ASSERT(aArray);
+            return !static_cast<nsTArray<OwningNonNull<nsIContent>>*>(aArray)
+                        ->Contains(&aNode);
+          },
+          arrayOfTopChildren, &aOutArrayOfContents);
+      aOutArrayOfContents.AppendElements(std::move(arrayOfTopChildren));
+    }
+    if (aCollectNonEditableNodes == CollectNonEditableNodes::No) {
+      for (size_t i : Reversed(IntegerRange(aOutArrayOfContents.Length()))) {
+        if (!EditorUtils::IsEditableContent(aOutArrayOfContents[i],
+                                            EditorUtils::EditorType::HTML)) {
+          aOutArrayOfContents.RemoveElementAt(i);
+        }
+      }
+    }
+  }
+
+  switch (aEditSubAction) {
+    case EditSubAction::eCreateOrRemoveBlock: {
+      // Certain operations should not act on li's and td's, but rather inside
+      // them.  Alter the list as needed.
+      CollectChildrenOptions options = {
+          CollectChildrenOption::CollectListChildren,
+          CollectChildrenOption::CollectTableChildren};
+      if (aCollectNonEditableNodes == CollectNonEditableNodes::No) {
+        options += CollectChildrenOption::IgnoreNonEditableChildren;
+      }
+      for (int32_t i = aOutArrayOfContents.Length() - 1; i >= 0; i--) {
+        OwningNonNull<nsIContent> content = aOutArrayOfContents[i];
+        if (HTMLEditUtils::IsListItem(content)) {
+          aOutArrayOfContents.RemoveElementAt(i);
+          HTMLEditUtils::CollectChildren(*content, aOutArrayOfContents, i,
+                                         options);
+        }
+      }
+      // Empty text node shouldn't be selected if unnecessary
+      for (int32_t i = aOutArrayOfContents.Length() - 1; i >= 0; i--) {
+        if (Text* text = aOutArrayOfContents[i]->GetAsText()) {
+          // Don't select empty text except to empty block
+          if (!HTMLEditUtils::IsVisibleTextNode(*text)) {
+            aOutArrayOfContents.RemoveElementAt(i);
+          }
+        }
+      }
+      break;
+    }
+    case EditSubAction::eCreateOrChangeList: {
+      // XXX aCollectNonEditableNodes is ignored here.  Maybe a bug.
+      CollectChildrenOptions options = {
+          CollectChildrenOption::CollectTableChildren};
+      for (size_t i = aOutArrayOfContents.Length(); i > 0; i--) {
+        // Scan for table elements.  If we find table elements other than
+        // table, replace it with a list of any editable non-table content
+        // because if a selection range starts from end in a table-cell and
+        // ends at or starts from outside the `<table>`, we need to make
+        // lists in each selected table-cells.
+        OwningNonNull<nsIContent> content = aOutArrayOfContents[i - 1];
+        if (HTMLEditUtils::IsAnyTableElementButNotTable(content)) {
+          aOutArrayOfContents.RemoveElementAt(i - 1);
+          HTMLEditUtils::CollectChildren(content, aOutArrayOfContents, i - 1,
+                                         options);
+        }
+      }
+      // If there is only one node in the array, and it is a `<div>`,
+      // `<blockquote>` or a list element, then look inside of it until we
+      // find inner list or content.
+      if (aOutArrayOfContents.Length() != 1) {
+        break;
+      }
+      Element* deepestDivBlockquoteOrListElement =
+          HTMLEditUtils::GetInclusiveDeepestFirstChildWhichHasOneChild(
+              aOutArrayOfContents[0],
+              {HTMLEditUtils::WalkTreeOption::IgnoreNonEditableNode},
+              nsGkAtoms::div, nsGkAtoms::blockquote, nsGkAtoms::ul,
+              nsGkAtoms::ol, nsGkAtoms::dl);
+      if (!deepestDivBlockquoteOrListElement) {
+        break;
+      }
+      if (deepestDivBlockquoteOrListElement->IsAnyOfHTMLElements(
+              nsGkAtoms::div, nsGkAtoms::blockquote)) {
+        aOutArrayOfContents.Clear();
+        // XXX Before we're called, non-editable nodes are ignored.  However,
+        //     we may append non-editable nodes here.
+        HTMLEditUtils::CollectChildren(*deepestDivBlockquoteOrListElement,
+                                       aOutArrayOfContents, 0, {});
+        break;
+      }
+      aOutArrayOfContents.ReplaceElementAt(
+          0, OwningNonNull<nsIContent>(*deepestDivBlockquoteOrListElement));
+      break;
+    }
+    case EditSubAction::eOutdent:
+    case EditSubAction::eIndent:
+    case EditSubAction::eSetPositionToAbsolute: {
+      // Indent/outdent already do something special for list items, but we
+      // still need to make sure we don't act on table elements
+      CollectChildrenOptions options = {
+          CollectChildrenOption::CollectListChildren,
+          CollectChildrenOption::CollectTableChildren};
+      if (aCollectNonEditableNodes == CollectNonEditableNodes::No) {
+        options += CollectChildrenOption::IgnoreNonEditableChildren;
+      }
+      for (int32_t i = aOutArrayOfContents.Length() - 1; i >= 0; i--) {
+        OwningNonNull<nsIContent> content = aOutArrayOfContents[i];
+        if (HTMLEditUtils::IsAnyTableElementButNotTable(content)) {
+          aOutArrayOfContents.RemoveElementAt(i);
+          HTMLEditUtils::CollectChildren(*content, aOutArrayOfContents, i,
+                                         options);
+        }
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
+  // Outdent should look inside of divs.
+  if (aEditSubAction == EditSubAction::eOutdent &&
+      !aHTMLEditor.IsCSSEnabled()) {
+    CollectChildrenOptions options = {};
+    if (aCollectNonEditableNodes == CollectNonEditableNodes::No) {
+      options += CollectChildrenOption::IgnoreNonEditableChildren;
+    }
+    for (int32_t i = aOutArrayOfContents.Length() - 1; i >= 0; i--) {
+      OwningNonNull<nsIContent> content = aOutArrayOfContents[i];
+      if (content->IsHTMLElement(nsGkAtoms::div)) {
+        aOutArrayOfContents.RemoveElementAt(i);
+        HTMLEditUtils::CollectChildren(*content, aOutArrayOfContents, i,
+                                       options);
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+Element* AutoRangeArray::GetClosestAncestorAnyListElementOfRange() const {
+  for (const OwningNonNull<nsRange>& range : mRanges) {
+    nsINode* commonAncestorNode = range->GetClosestCommonInclusiveAncestor();
+    if (MOZ_UNLIKELY(!commonAncestorNode)) {
+      continue;
+    }
+    for (Element* element :
+         commonAncestorNode->InclusiveAncestorsOfType<Element>()) {
+      if (HTMLEditUtils::IsAnyListElement(element)) {
+        return element;
+      }
+    }
+  }
+  return nullptr;
+}
+
+}  // namespace mozilla