fdo#34558 don't crash on undoing text frame removal

Change-Id: I48b95c6c0cbfb2f4c4b09cc90b254b96de40b3e9

svx/inc/svx/svdundo.hxx

@@ -20,6 +20,7 @@
 #ifndef _SVDUNDO_HXX
 #define _SVDUNDO_HXX
 
+#include <svl/lstner.hxx>
 #include <svl/solar.hrc>
 #include <svl/undo.hxx>
 #include <tools/gen.hxx>
@@ -252,9 +253,12 @@ public:
 //
 //************************************************************
 
-class SVX_DLLPUBLIC SdrUndoObjList : public SdrUndoObj {
+class SVX_DLLPUBLIC SdrUndoObjList : public SdrUndoObj, public SfxListener {
     bool                        bOwner;
 
+public:
+    TYPEINFO();
+
 protected:
     SdrObjList*                 pObjList;
     SdrView*                    pView;      // um bei ObjDel, Undo die
@@ -270,6 +274,9 @@ protected:
     void SetView(SdrView* pView1, SdrPageView* pPageView1) { pView=pView1; pPageView=pPageView1; }
     bool IsOwner() { return bOwner; }
     void SetOwner(bool bNew);
+
+private:
+    virtual void Notify(SfxBroadcaster& rBroadcaster, const SfxHint& rHint);
 };
 
 //************************************************************

svx/source/svdraw/svdundo.cxx

@@ -655,6 +655,8 @@ OUString SdrUndoGeoObj::GetComment() const
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+TYPEINIT1(SdrUndoObjList, SfxListener);
+
 SdrUndoObjList::SdrUndoObjList(SdrObject& rNewObj, bool bOrdNumDirect)
 :   SdrUndoObj(rNewObj),
     bOwner(sal_False),
@@ -667,10 +669,14 @@ SdrUndoObjList::SdrUndoObjList(SdrObject& rNewObj, bool bOrdNumDirect)
     } else {
         nOrdNum=pObj->GetOrdNum();
     }
+
+    StartListening(*pObjList->GetModel());
 }
 
 SdrUndoObjList::~SdrUndoObjList()
 {
+    EndListening(*pObjList->GetModel());
+
     if (pObj!=NULL && IsOwner())
     {
         // Attribute have to go back to the regular Pool
@@ -686,6 +692,20 @@ void SdrUndoObjList::SetOwner(bool bNew)
     bOwner = bNew;
 }
 
+void SdrUndoObjList::Notify(SfxBroadcaster&, const SfxHint& rHint)
+{
+    const SdrHint* pSdrHint(dynamic_cast<const SdrHint*>(&rHint));
+    if (pSdrHint)
+    {
+        if ((pSdrHint->GetObject() == pObj) && (pSdrHint->GetKind() == HINT_OBJCHG))
+        {
+            const sal_uInt32 nNewOrdNum(pObj->GetOrdNum());
+            if (nNewOrdNum != nOrdNum)
+                nOrdNum = nNewOrdNum;
+        }
+    }
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 void SdrUndoRemoveObj::Undo()