tdf#96888 Kill internal vcl dog-tags ...

Did some changes to syswin.cxx file. Patch No. 18

Change-Id: I79d3ea2110ae72762681ae494ee44ba7fc61e112
Reviewed-on: https://gerrit.libreoffice.org/21235Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

vcl/source/window/syswin.cxx

@@ -219,12 +219,10 @@ TaskPaneList* SystemWindow::GetTaskPaneList()
 
 bool SystemWindow::Close()
 {
-    ImplDelData aDelData;
-    ImplAddDel( &aDelData );
+    VclPtr<vcl::Window> xWindow = this;
     CallEventListeners( VCLEVENT_WINDOW_CLOSE );
-    if ( aDelData.IsDead() )
+    if ( xWindow->IsDisposed() )
         return false;
-    ImplRemoveDel( &aDelData );
 
     if ( mpWindowImpl->mxWindowPeer.is() && IsCreatedWithToolkit() )
         return false;