Resolves: rhbz#673819 crash on changing position of drawing object in header

The header/footer objects are cunning wrappers to pretend to some parts
of the drawing stuff that there are multiple objects, while in reality
there is only one. So call HasText actually gets a totally different
object from the cast :-(
Signed-off-by: David Tardon <dtardon@redhat.com>

cui/source/tabpages/swpossizetabpage.cxx

@@ -1930,7 +1930,10 @@ void SvxSwPosSizeTabPage::SetView( const SdrView* pSdrView )
     }
 
     // this should happen via SID_ATTR_TRANSFORM_AUTOSIZE
-    if( rMarkList.GetMarkCount() == 1 )
+    if( rMarkList.GetMarkCount() != 1 )
+        m_bIsMultiSelection = true;
+#if OSL_DEBUG_LEVEL > 1
+    else
     {
         const SdrObject* pObj = rMarkList.GetMark( 0 )->GetMarkedSdrObj();
         SdrObjKind eKind = (SdrObjKind) pObj->GetObjIdentifier();
@@ -1941,8 +1944,7 @@ void SvxSwPosSizeTabPage::SetView( const SdrView* pSdrView )
             DBG_ERROR("AutoWidth/AutoHeight should be enabled");
         }
     }
-    else
-        m_bIsMultiSelection = true;
+#endif
 
     // use page offset and recalculate
     Point aPt( m_pSdrView->GetSdrPageView()->GetPageOrigin() );