coverity#735840 Unchecked dynamic_cast

Change-Id: I3c772ec30360103f569b34e7c83f65b469eb5be8

sd/inc/drawdoc.hxx

@@ -212,9 +212,12 @@ public:
                         SdDrawDocument(DocumentType eType, SfxObjectShell* pDocSh);
                         virtual ~SdDrawDocument();
 
-    virtual SdrModel*   AllocModel() const SAL_OVERRIDE;
-    virtual SdrPage*    AllocPage(bool bMasterPage) SAL_OVERRIDE;
+    SdDrawDocument*     AllocSdDrawDocument() const;
+    virtual SdrModel*   AllocModel() const SAL_OVERRIDE; //forwards to AllocSdDrawDocument
+
     SdPage*             AllocSdPage(bool bMasterPage);
+    virtual SdrPage*    AllocPage(bool bMasterPage) SAL_OVERRIDE; //forwards to AllocSdPage
+
     virtual bool        IsReadOnly() const SAL_OVERRIDE;
     virtual void        SetChanged(bool bFlag = true) SAL_OVERRIDE;
 

sd/source/core/drawdoc.cxx

@@ -434,10 +434,15 @@ SdDrawDocument::~SdDrawDocument()
     mpCharClass = NULL;
 }
 
+SdrModel* SdDrawDocument::AllocModel() const
+{
+    return AllocSdDrawDocument();
+}
+
 // This method creates a new document (SdDrawDocument) and returns a pointer to
 // said document. The drawing engine uses this method to put the document (or
 // parts of it) into the clipboard/DragServer.
-SdrModel* SdDrawDocument::AllocModel() const
+SdDrawDocument* SdDrawDocument::AllocSdDrawDocument() const
 {
     SdDrawDocument* pNewModel = NULL;
 

sd/source/ui/slidesorter/controller/SlsClipboard.cxx

@@ -467,7 +467,7 @@ void Clipboard::CreateSlideTransferable (
             SD_MOD()->pTransferClip = pTransferable;
 
         pDocument->CreatingDataObj (pTransferable);
-        pTransferable->SetWorkDocument( dynamic_cast<SdDrawDocument*>(pDocument->AllocModel()) );
+        pTransferable->SetWorkDocument(pDocument->AllocSdDrawDocument());
         pDocument->CreatingDataObj (NULL);
         TransferableObjectDescriptor aObjDesc;
         pTransferable->GetWorkDocument()->GetDocSh()
@@ -573,8 +573,7 @@ void Clipboard::CreateSlideTransferable (
             new TransferableData(
                 pSlideSorterViewShell,
                 aRepresentatives));
-        pTransferable->SetWorkDocument( dynamic_cast<SdDrawDocument*>(
-                pTreeListBoxTransferable->GetSourceDoc()->AllocModel()));
+        pTransferable->SetWorkDocument(pTreeListBoxTransferable->GetSourceDoc()->AllocSdDrawDocument());
         //        pTransferable->SetView(&mrSlideSorter.GetView());
 
         // Set page bookmark list.