Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 516 insertions, 0 deletions

diff --git a/layout/mathml/nsMathMLContainerFrame.h b/layout/mathml/nsMathMLContainerFrame.h
new file mode 100644
index 0000000000..49afd1d1fa
--- /dev/null
+++ b/layout/mathml/nsMathMLContainerFrame.h
@@ -0,0 +1,516 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef nsMathMLContainerFrame_h___
+#define nsMathMLContainerFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+#include "nsBlockFrame.h"
+#include "nsInlineFrame.h"
+#include "nsMathMLOperators.h"
+#include "nsMathMLFrame.h"
+#include "mozilla/Likely.h"
+
+namespace mozilla {
+class PresShell;
+}  // namespace mozilla
+
+/*
+ * Base class for MathML container frames. It acts like an inferred
+ * mrow. By default, this frame uses its Reflow() method to lay its
+ * children horizontally and ensure that their baselines are aligned.
+ * The Reflow() method relies upon Place() to position children.
+ * By overloading Place() in derived classes, it is therefore possible
+ * to position children in various customized ways.
+ */
+
+// Options for the preferred size at which to stretch our stretchy children
+#define STRETCH_CONSIDER_ACTUAL_SIZE 0x00000001  // just use our current size
+#define STRETCH_CONSIDER_EMBELLISHMENTS \
+  0x00000002  // size calculations include embellishments
+
+class nsMathMLContainerFrame : public nsContainerFrame, public nsMathMLFrame {
+ public:
+  nsMathMLContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
+                         ClassID aID)
+      : nsContainerFrame(aStyle, aPresContext, aID),
+        mIntrinsicWidth(NS_INTRINSIC_ISIZE_UNKNOWN),
+        mBlockStartAscent(0) {}
+
+  NS_DECL_QUERYFRAME_TARGET(nsMathMLContainerFrame)
+  NS_DECL_QUERYFRAME
+  NS_DECL_ABSTRACT_FRAME(nsMathMLContainerFrame)
+
+  // --------------------------------------------------------------------------
+  // Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h
+
+  NS_IMETHOD
+  Stretch(DrawTarget* aDrawTarget, nsStretchDirection aStretchDirection,
+          nsBoundingMetrics& aContainerSize,
+          ReflowOutput& aDesiredStretchSize) override;
+
+  NS_IMETHOD
+  UpdatePresentationDataFromChildAt(int32_t aFirstIndex, int32_t aLastIndex,
+                                    uint32_t aFlagsValues,
+                                    uint32_t aFlagsToUpdate) override {
+    PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex,
+                                         aFlagsValues, aFlagsToUpdate);
+    return NS_OK;
+  }
+
+  // --------------------------------------------------------------------------
+  // Overloaded nsContainerFrame methods -- see documentation in nsIFrame.h
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override {
+    if (aFlags & (eLineParticipant | eSupportsContainLayoutAndPaint)) {
+      return false;
+    }
+    return nsContainerFrame::IsFrameOfType(aFlags & ~eMathML);
+  }
+
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
+
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override;
+
+  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override;
+
+  /**
+   * Both GetMinISize and GetPrefISize use the intrinsic width metrics
+   * returned by GetIntrinsicMetrics, including ink overflow.
+   */
+  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
+  virtual nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+  /**
+   * Return the intrinsic horizontal metrics of the frame's content area.
+   */
+  virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
+                                        ReflowOutput& aDesiredSize);
+
+  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+                      const ReflowInput& aReflowInput,
+                      nsReflowStatus& aStatus) override;
+
+  virtual void DidReflow(nsPresContext* aPresContext,
+                         const ReflowInput* aReflowInput) override
+
+  {
+    mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE;
+    return nsContainerFrame::DidReflow(aPresContext, aReflowInput);
+  }
+
+  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                const nsDisplayListSet& aLists) override;
+
+  bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) override;
+
+  virtual void MarkIntrinsicISizesDirty() override;
+
+  // Notification when an attribute is changed. The MathML module uses the
+  // following paradigm:
+  //
+  // 1. If the MathML frame class doesn't have any cached automatic data that
+  //    depends on the attribute: we just reflow (e.g., this happens with
+  //    <msub>, <msup>, <mmultiscripts>, etc). This is the default behavior
+  //    implemented by this base class.
+  //
+  // 2. If the MathML frame class has cached automatic data that depends on
+  //    the attribute:
+  //    2a. If the automatic data to update resides only within the descendants,
+  //        we just re-layout them using ReLayoutChildren(this);
+  //        (e.g., this happens with <ms>).
+  //    2b. If the automatic data to update affects us in some way, we ask our
+  //        parent to re-layout its children using ReLayoutChildren(mParent);
+  //        Therefore, there is an overhead here in that our siblings are
+  //        re-laid too (e.g., this happens with <munder>, <mover>,
+  //        <munderover>).
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  // helper function to apply mirroring to a horizontal coordinate, if needed.
+  nscoord MirrorIfRTL(nscoord aParentWidth, nscoord aChildWidth,
+                      nscoord aChildLeading) {
+    return StyleVisibility()->mDirection == mozilla::StyleDirection::Rtl
+               ? aParentWidth - aChildWidth - aChildLeading
+               : aChildLeading;
+  }
+
+  // --------------------------------------------------------------------------
+  // Additional methods
+
+ protected:
+  /* Place :
+   * This method is used to measure or position child frames and other
+   * elements.  It may be called any number of times with aPlaceOrigin
+   * false to measure, and the final call of the Reflow process before
+   * returning from Reflow() or Stretch() will have aPlaceOrigin true
+   * to position the elements.
+   *
+   * IMPORTANT: This method uses GetReflowAndBoundingMetricsFor() which must
+   * have been set up with SaveReflowAndBoundingMetricsFor().
+   *
+   * The Place() method will use this information to compute the desired size
+   * of the frame.
+   *
+   * @param aPlaceOrigin [in]
+   *        If aPlaceOrigin is false, compute your desired size using the
+   *        information from GetReflowAndBoundingMetricsFor.  However, child
+   *        frames or other elements should not be repositioned.
+   *
+   *        If aPlaceOrigin is true, reflow is finished. You should position
+   *        all your children, and return your desired size. You should now
+   *        use FinishReflowChild() on your children to complete post-reflow
+   *        operations.
+   *
+   * @param aDesiredSize [out] parameter where you should return your desired
+   *        size and your ascent/descent info. Compute your desired size using
+   *        the information from GetReflowAndBoundingMetricsFor, and include
+   *        any space you want for border/padding in the desired size you
+   *        return.
+   */
+  virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
+                         ReflowOutput& aDesiredSize);
+
+  // MeasureForWidth:
+  //
+  // A method used by nsMathMLContainerFrame::GetIntrinsicISize to get the
+  // width that a particular Place method desires.  For most frames, this will
+  // just call the object's Place method.  However <msqrt> and <menclose> use
+  // nsMathMLContainerFrame::GetIntrinsicISize to measure the child frames as
+  // if in an <mrow>, and so their frames implement MeasureForWidth to use
+  // nsMathMLContainerFrame::Place.
+  virtual nsresult MeasureForWidth(DrawTarget* aDrawTarget,
+                                   ReflowOutput& aDesiredSize);
+
+  // helper to re-sync the automatic data in our children and notify our parent
+  // to reflow us when changes (e.g., append/insert/remove) happen in our child
+  // list
+  virtual nsresult ChildListChanged(int32_t aModType);
+
+  // helper to get the preferred size that a container frame should use to fire
+  // the stretch on its stretchy child frames.
+  void GetPreferredStretchSize(DrawTarget* aDrawTarget, uint32_t aOptions,
+                               nsStretchDirection aStretchDirection,
+                               nsBoundingMetrics& aPreferredStretchSize);
+
+  // helper used by mstyle, mphantom, mpadded and mrow in their implementation
+  // of TransmitAutomaticData() to determine whether they are space-like.
+  nsresult TransmitAutomaticDataForMrowLikeElement();
+
+ public:
+  /*
+   * Helper to render the frame as a default mrow-like container or as a visual
+   * feedback to the user when an error (typically invalid markup) was
+   * encountered during reflow. Parameters are the same as Place().
+   */
+  nsresult PlaceForError(DrawTarget* aDrawTarget, bool aPlaceOrigin,
+                         ReflowOutput& aDesiredSize);
+
+  // error handlers to provide a visual feedback to the user when an error
+  // (typically invalid markup) was encountered during reflow.
+  nsresult ReflowError(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize);
+  /*
+   * Helper to call ReportErrorToConsole for parse errors involving
+   * attribute/value pairs.
+   * @param aAttribute The attribute for which the parse error occured.
+   * @param aValue The value for which the parse error occured.
+   */
+  nsresult ReportParseError(const char16_t* aAttribute, const char16_t* aValue);
+
+  /*
+   * Helper to call ReportErrorToConsole when certain tags
+   * have more than the expected amount of children.
+   */
+  nsresult ReportChildCountError();
+
+  /*
+   * Helper to call ReportErrorToConsole when certain tags have
+   * invalid child tags
+   * @param aChildTag The tag which is forbidden in this context
+   */
+  nsresult ReportInvalidChildError(nsAtom* aChildTag);
+
+  /*
+   * Helper to call ReportToConsole when an error occurs.
+   * @param aParams see nsContentUtils::ReportToConsole
+   */
+  nsresult ReportErrorToConsole(
+      const char* aErrorMsgId,
+      const nsTArray<nsString>& aParams = nsTArray<nsString>());
+
+  // helper method to reflow a child frame. We are inline frames, and we don't
+  // know our positions until reflow is finished. That's why we ask the
+  // base method not to worry about our position.
+  void ReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext,
+                   ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput,
+                   nsReflowStatus& aStatus);
+
+ protected:
+  // helper to add the inter-spacing when <math> is the immediate parent.
+  // Since we don't (yet) handle the root <math> element ourselves, we need to
+  // take special care of the inter-frame spacing on elements for which <math>
+  // is the direct xml parent. This function will be repeatedly called from
+  // left to right on the childframes of <math>, and by so doing it will
+  // emulate the spacing that would have been done by a <mrow> container.
+  // e.g., it fixes <math> <mi>f</mi> <mo>q</mo> <mi>f</mi> <mo>I</mo> </math>
+  virtual nscoord FixInterFrameSpacing(ReflowOutput& aDesiredSize);
+
+  // helper method to complete the post-reflow hook and ensure that embellished
+  // operators don't terminate their Reflow without receiving a Stretch command.
+  virtual nsresult FinalizeReflow(DrawTarget* aDrawTarget,
+                                  ReflowOutput& aDesiredSize);
+
+  // Record metrics of a child frame for recovery through the following method
+  static void SaveReflowAndBoundingMetricsFor(
+      nsIFrame* aFrame, const ReflowOutput& aReflowOutput,
+      const nsBoundingMetrics& aBoundingMetrics);
+
+  // helper method to facilitate getting the reflow and bounding metrics of a
+  // child frame.  The argument aMathMLFrameType, when non null, will return
+  // the 'type' of the frame, which is used to determine the inter-frame
+  // spacing.
+  // IMPORTANT: This function is only meant to be called in Place() methods as
+  // the information is available only when set up with the above method
+  // during Reflow/Stretch() and GetPrefISize().
+  static void GetReflowAndBoundingMetricsFor(
+      nsIFrame* aFrame, ReflowOutput& aReflowOutput,
+      nsBoundingMetrics& aBoundingMetrics,
+      eMathMLFrameType* aMathMLFrameType = nullptr);
+
+  // helper method to clear metrics saved with
+  // SaveReflowAndBoundingMetricsFor() from all child frames.
+  void ClearSavedChildMetrics();
+
+  // helper to let the update of presentation data pass through
+  // a subtree that may contain non-MathML container frames
+  static void PropagatePresentationDataFor(nsIFrame* aFrame,
+                                           uint32_t aFlagsValues,
+                                           uint32_t aFlagsToUpdate);
+
+ public:
+  static void PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame,
+                                                   int32_t aFirstChildIndex,
+                                                   int32_t aLastChildIndex,
+                                                   uint32_t aFlagsValues,
+                                                   uint32_t aFlagsToUpdate);
+
+  // Sets flags on aFrame and all descendant frames
+  static void PropagateFrameFlagFor(nsIFrame* aFrame, nsFrameState aFlags);
+
+  // helper to let the rebuild of automatic data (presentation data
+  // and embellishement data) walk through a subtree that may contain
+  // non-MathML container frames. Note that this method re-builds the
+  // automatic data in the children -- not in aParentFrame itself (except
+  // for those particular operations that the parent frame may do in its
+  // TransmitAutomaticData()). The reason it works this way is because
+  // a container frame knows what it wants for its children, whereas children
+  // have no clue who their parent is. For example, it is <mfrac> who knows
+  // that its children have to be in scriptsizes, and has to transmit this
+  // information to them. Hence, when changes occur in a child frame, the child
+  // has to request the re-build from its parent. Unfortunately, the extra cost
+  // for this is that it will re-sync in the siblings of the child as well.
+  static void RebuildAutomaticDataForChildren(nsIFrame* aParentFrame);
+
+  // helper to blow away the automatic data cached in a frame's subtree and
+  // re-layout its subtree to reflect changes that may have happen. In the
+  // event where aParentFrame isn't a MathML frame, it will first walk up to
+  // the ancestor that is a MathML frame, and re-layout from there -- this is
+  // to guarantee that automatic data will be rebuilt properly. Note that this
+  // method re-builds the automatic data in the children -- not in the parent
+  // frame itself (except for those particular operations that the parent frame
+  // may do do its TransmitAutomaticData()). @see
+  // RebuildAutomaticDataForChildren
+  //
+  // aBits are the bits to pass to FrameNeedsReflow() when we call it.
+  static nsresult ReLayoutChildren(nsIFrame* aParentFrame);
+
+ protected:
+  // Helper method which positions child frames as an <mrow> on given baseline
+  // y = aBaseline starting from x = aOffsetX, calling FinishReflowChild()
+  // on the frames.
+  void PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline);
+
+  // A variant on FinishAndStoreOverflow() that uses the union of child
+  // overflows, the frame bounds, and mBoundingMetrics to set and store the
+  // overflow.
+  void GatherAndStoreOverflow(ReflowOutput* aMetrics);
+
+  /**
+   * Call DidReflow() if the NS_FRAME_IN_REFLOW frame bit is set on aFirst and
+   * all its next siblings up to, but not including, aStop.
+   * aStop == nullptr meaning all next siblings with the bit set.
+   * The method does nothing if aFirst == nullptr.
+   */
+  static void DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop = nullptr);
+
+  /**
+   * Recompute mIntrinsicWidth if it's not already up to date.
+   */
+  void UpdateIntrinsicWidth(gfxContext* aRenderingContext);
+
+  nscoord mIntrinsicWidth;
+
+  nscoord mBlockStartAscent;
+
+ private:
+  class RowChildFrameIterator;
+  friend class RowChildFrameIterator;
+};
+
+// --------------------------------------------------------------------------
+// Currently, to benefit from line-breaking inside the <math> element, <math> is
+// simply mapping to nsBlockFrame or nsInlineFrame.
+// A separate implemention needs to provide:
+// 1) line-breaking
+// 2) proper inter-frame spacing
+// 3) firing of Stretch() (in which case FinalizeReflow() would have to be
+//    cleaned)
+// Issues: If/when mathml becomes a pluggable component, the separation will be
+// needed.
+class nsMathMLmathBlockFrame final : public nsBlockFrame {
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathBlockFrame)
+
+  friend nsContainerFrame* NS_NewMathMLmathBlockFrame(
+      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
+
+  // beware, mFrames is not set by nsBlockFrame
+  // cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set
+  // mFrames
+  void SetInitialChildList(ChildListID aListID,
+                           nsFrameList&& aChildList) override {
+    MOZ_ASSERT(aListID == mozilla::FrameChildListID::Principal ||
+                   aListID == mozilla::FrameChildListID::Backdrop,
+               "unexpected frame list");
+    nsBlockFrame::SetInitialChildList(aListID, std::move(aChildList));
+    if (aListID == mozilla::FrameChildListID::Principal) {
+      // re-resolve our subtree to set any mathml-expected data
+      nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
+    }
+  }
+
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsBlockFrame::AppendFrames(aListID, std::move(aFrameList));
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsBlockFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
+                               std::move(aFrameList));
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsBlockFrame::RemoveFrame(aListID, aOldFrame);
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override {
+    return nsBlockFrame::IsFrameOfType(aFlags & ~nsIFrame::eMathML);
+  }
+
+  // See nsIMathMLFrame.h
+  bool IsMrowLike() {
+    return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
+  }
+
+ protected:
+  explicit nsMathMLmathBlockFrame(ComputedStyle* aStyle,
+                                  nsPresContext* aPresContext)
+      : nsBlockFrame(aStyle, aPresContext, kClassID) {
+    // We should always have a float manager.  Not that things can really try
+    // to float out of us anyway, but we need one for line layout.
+    // Bug 1301881: Do we still need to set NS_BLOCK_FLOAT_MGR?
+    // AddStateBits(NS_BLOCK_FLOAT_MGR);
+  }
+  virtual ~nsMathMLmathBlockFrame() = default;
+};
+
+// --------------
+
+class nsMathMLmathInlineFrame final : public nsInlineFrame,
+                                      public nsMathMLFrame {
+ public:
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame)
+
+  friend nsContainerFrame* NS_NewMathMLmathInlineFrame(
+      mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
+
+  void SetInitialChildList(ChildListID aListID,
+                           nsFrameList&& aChildList) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal,
+                 "unexpected frame list");
+    nsInlineFrame::SetInitialChildList(aListID, std::move(aChildList));
+    // re-resolve our subtree to set any mathml-expected data
+    nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this);
+  }
+
+  void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsInlineFrame::AppendFrames(aListID, std::move(aFrameList));
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+                    const nsLineList::iterator* aPrevFrameLine,
+                    nsFrameList&& aFrameList) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsInlineFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
+                                std::move(aFrameList));
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  virtual void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) override {
+    NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal ||
+                     aListID == mozilla::FrameChildListID::NoReflowPrincipal,
+                 "unexpected frame list");
+    nsInlineFrame::RemoveFrame(aListID, aOldFrame);
+    if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal))
+      nsMathMLContainerFrame::ReLayoutChildren(this);
+  }
+
+  virtual bool IsFrameOfType(uint32_t aFlags) const override {
+    return nsInlineFrame::IsFrameOfType(aFlags & ~nsIFrame::eMathML);
+  }
+
+  bool IsMrowLike() override {
+    return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild();
+  }
+
+ protected:
+  explicit nsMathMLmathInlineFrame(ComputedStyle* aStyle,
+                                   nsPresContext* aPresContext)
+      : nsInlineFrame(aStyle, aPresContext, kClassID) {}
+
+  virtual ~nsMathMLmathInlineFrame() = default;
+};
+
+#endif /* nsMathMLContainerFrame_h___ */