Resolves: tdf#70062 avoid crash on ungrouping "ac char" group

If you can't group a char-anchored thing with something else, then you can't
ungroup a selection that contains a char-anchored group.

You can group together non-char anchored things, then change the anchor type to
get a char-anchored group to get into this situation.

Change-Id: Id627bd11e2c749ad08fb902bf88f937ff5f06a12

sw/inc/fesh.hxx

@@ -506,6 +506,7 @@ public:
                                     it is possible that there are groups included. */
 
     bool IsGroupAllowed() const;
+    bool IsUnGroupAllowed() const;
 
     void MirrorSelection( bool bHorizontal );   ///< Vertical if FALSE.
 

sw/source/core/frmedt/feshview.cxx

@@ -2073,6 +2073,25 @@ bool SwFEShell::IsGroupSelected()
     return false;
 }
 
+namespace
+{
+    bool HasSuitableGroupingAnchor(const SdrObject* pObj)
+    {
+        bool bSuitable = true;
+        SwFrmFmt* pFrmFmt(::FindFrmFmt(const_cast<SdrObject*>(pObj)));
+        if (!pFrmFmt)
+        {
+            OSL_FAIL( "<HasSuitableGroupingAnchor> - missing frame format" );
+            bSuitable = false;
+        }
+        else if (FLY_AS_CHAR == pFrmFmt->GetAnchor().GetAnchorId())
+        {
+            bSuitable = false;
+        }
+        return bSuitable;
+    }
+}
+
 // Change return type.
 // Adjustments for drawing objects in header/footer:
 //      allow group, only if all selected objects are in the same header/footer
@@ -2095,18 +2114,7 @@ bool SwFEShell::IsGroupAllowed() const
                 pUpGroup = pObj->GetUpGroup();
 
             if ( bIsGroupAllowed )
-            {
-                SwFrmFmt* pFrmFmt( ::FindFrmFmt( const_cast<SdrObject*>(pObj) ) );
-                if ( !pFrmFmt )
-                {
-                    OSL_FAIL( "<SwFEShell::IsGroupAllowed()> - missing frame format" );
-                    bIsGroupAllowed = false;
-                }
-                else if ( FLY_AS_CHAR == pFrmFmt->GetAnchor().GetAnchorId() )
-                {
-                    bIsGroupAllowed = false;
-                }
-            }
+                bIsGroupAllowed = HasSuitableGroupingAnchor(pObj);
 
             // check, if all selected objects are in the
             // same header/footer or not in header/footer.
@@ -2143,13 +2151,28 @@ bool SwFEShell::IsGroupAllowed() const
                     }
                 }
             }
-
         }
     }
 
     return bIsGroupAllowed;
 }
 
+bool SwFEShell::IsUnGroupAllowed() const
+{
+    bool bIsUnGroupAllowed = false;
+
+    const SdrMarkList &rMrkList = Imp()->GetDrawView()->GetMarkedObjectList();
+    for (size_t i = 0; i < rMrkList.GetMarkCount(); ++i)
+    {
+        const SdrObject* pObj = rMrkList.GetMark(i)->GetMarkedSdrObj();
+        bIsUnGroupAllowed = HasSuitableGroupingAnchor(pObj);
+        if (!bIsUnGroupAllowed)
+            break;
+    }
+
+    return bIsUnGroupAllowed;
+}
+
 // The group gets the anchor and the contactobject of the first in the selection
 void SwFEShell::GroupSelection()
 {

sw/source/uibase/shells/drwbassh.cxx

@@ -400,7 +400,7 @@ void SwDrawBaseShell::Execute(SfxRequest &rReq)
             break;
 
         case SID_UNGROUP:
-            if (pSh->IsGroupSelected())
+            if (pSh->IsGroupSelected() && pSh->IsUnGroupAllowed())
             {
                 pSh->UnGroupSelection();
                 rBind.Invalidate(SID_GROUP);
@@ -652,7 +652,7 @@ void SwDrawBaseShell::GetState(SfxItemSet& rSet)
                     rSet.DisableItem( nWhich );
                 break;
             case SID_UNGROUP:
-                if ( !rSh.IsGroupSelected() || bProtected )
+                if ( !rSh.IsGroupSelected() || bProtected || !rSh.IsUnGroupAllowed() )
                     rSet.DisableItem( nWhich );
                 break;
             case SID_ENTER_GROUP: