i123350 Added Clear() implementation to SdrUndoManager to only delete text edit…

i123350 Added Clear() implementation to SdrUndoManager to only delete text edit part of the undo stack

svx/inc/svx/sdrundomanager.hxx

@@ -51,6 +51,9 @@ public:
     virtual sal_Bool Undo();
     virtual sal_Bool Redo();
 
+    // ##
+    virtual void Clear();
+
     // Call for the view which starts the interactive text edit. Use link to
     // activate (start text edit) and empty link to reset (end text edit). On
     // reset all text edit actions will be removed from this undo manager to

svx/source/svdraw/sdrundomanager.cxx

@@ -85,6 +85,25 @@ sal_Bool SdrUndoManager::Redo()
     return bRetval;
 }
 
+void SdrUndoManager::Clear()
+{
+    if(isTextEditActive())
+    {
+        while(GetUndoActionCount() && mpLastUndoActionBeforeTextEdit != GetUndoAction(0))
+        {
+            RemoveLastUndoAction();
+        }
+
+        // urgently needed: RemoveLastUndoAction does NOT correct the Redo stack by itself (!)
+        ClearRedo();
+    }
+    else
+    {
+        // call parent
+        EditUndoManager::Clear();
+    }
+}
+
 void SdrUndoManager::SetEndTextEditHdl(const Link& rLink)
 {
     maEndTextEditHdl = rLink;