3 files changed, 26 insertions, 9 deletions
diff --git a/vcl/inc/osx/a11ywrapper.h b/vcl/inc/osx/a11ywrapper.h
index 1eb4039c57..48fdd8e2a5 100644
--- a/vcl/inc/osx/a11ywrapper.h
+++ b/vcl/inc/osx/a11ywrapper.h
@@ -67,6 +67,7 @@ struct ReferenceWrapper
     ReferenceWrapper maReferenceWrapper;
     BOOL mActsAsRadioGroup;
     BOOL mIsTableCell;
+    BOOL mIsDisposed;
 }
 // NSAccessibility Protocol
 -(id)accessibilityAttributeValue:(NSString *)attribute;
@@ -101,6 +102,7 @@ struct ReferenceWrapper
 -(NSWindow*)windowForParent;
 -(id)init;
 -(id)initWithAccessibleContext: (css::uno::Reference < css::accessibility::XAccessibleContext >) anAccessibleContext;
+-(void)setDisposed;
 -(void) setDefaults: (css::uno::Reference < css::accessibility::XAccessibleContext >) rxAccessibleContext;
 +(void)setPopupMenuOpen:(BOOL)popupMenuOpen;
 -(css::accessibility::XAccessibleAction *)accessibleAction;
diff --git a/vcl/inc/qt5/QtTransferable.hxx b/vcl/inc/qt5/QtTransferable.hxx
index 5f1533dd59..5687fa06df 100644
--- a/vcl/inc/qt5/QtTransferable.hxx
+++ b/vcl/inc/qt5/QtTransferable.hxx
@@ -34,13 +34,23 @@ class QtTransferable : public cppu::WeakImplHelper<css::datatransfer::XTransfera
     QtTransferable(const QtTransferable&) = delete;
 
     const QMimeData* m_pMimeData;
-    osl::Mutex m_aMutex;
-    bool m_bProvideUTF16FromOtherEncoding;
-    css::uno::Sequence<css::datatransfer::DataFlavor> m_aMimeTypeSeq;
+
+protected:
+    /** Sets new mime data.
+     *  Since data flavors supported by this class depend on the mime data,
+     *  results from previous calls to the public methods of this
+     *  class are no longer valid after setting new mime data using this method.
+     *
+     *  Subclasses that set new mime data must ensure that no data race exists
+     *  on m_pMimeData.
+     *  (For the current only subclass doing so, QtClipboardTransferable, all access
+     *  to m_pMimeData happens with the SolarMutex held.)
+     */
+    void setMimeData(const QMimeData* pMimeData) { m_pMimeData = pMimeData; }
+    const QMimeData* mimeData() const { return m_pMimeData; }
 
 public:
     QtTransferable(const QMimeData* pMimeData);
-    const QMimeData* mimeData() const { return m_pMimeData; }
 
     css::uno::Sequence<css::datatransfer::DataFlavor> SAL_CALL getTransferDataFlavors() override;
     sal_Bool SAL_CALL isDataFlavorSupported(const css::datatransfer::DataFlavor& rFlavor) override;
@@ -54,21 +64,24 @@ public:
  * the QClipboard's object thread, which is the QApplication's thread, so all of
  * the access has to go through RunInMainThread().
  *
- * If we detect a QMimeData change, we simply drop reporting any content. In theory
- * we can recover in the case where there hadn't been any calls of the XTransferable
- * interface, but currently we don't. But we ensure to never report mixed content,
- * so we'll just cease operation on QMimeData change.
+ * If we detect a QMimeData change, the mime data is updated with the new one from
+ * the system clipboard. Note however that this means that results of any previous
+ * calls of the XTransferable interface will be out of sync with the newly set mime
+ * data, so this scenario should generally be avoided.
  **/
 class QtClipboardTransferable final : public QtTransferable
 {
     // to detect in-flight QMimeData changes
     const QClipboard::Mode m_aMode;
 
-    bool hasInFlightChanged() const;
+    void ensureConsistencyWithSystemClipboard();
 
 public:
     explicit QtClipboardTransferable(const QClipboard::Mode aMode, const QMimeData* pMimeData);
 
+    // whether pMimeData are the current mime data
+    bool hasMimeData(const QMimeData* pMimeData) const;
+
     // these are the same then QtTransferable, except they go through RunInMainThread
     css::uno::Sequence<css::datatransfer::DataFlavor> SAL_CALL getTransferDataFlavors() override;
     sal_Bool SAL_CALL isDataFlavorSupported(const css::datatransfer::DataFlavor& rFlavor) override;
diff --git a/vcl/inc/salvtables.hxx b/vcl/inc/salvtables.hxx
index 4074e097a4..d6d3a90ce2 100644
--- a/vcl/inc/salvtables.hxx
+++ b/vcl/inc/salvtables.hxx
@@ -922,6 +922,8 @@ public:
         return 20 * (pDefault ? pDefault->GetDPIScaleFactor() : 1.0);
     }
 
+    void set_max_drop_down_rows(int nRows) override { m_xComboBox->SetDropDownLineCount(nRows); }
+
     void CallHandleEventListener(VclWindowEvent& rEvent)
     {
         if (rEvent.GetId() == VclEventId::DropdownPreOpen