tdf#92088 - don't invalidate disposed toolbar items.

Change-Id: Ie90906f1ed8dc205850df3a48688f66b7a72a4f4
Reviewed-on: https://gerrit.libreoffice.org/16343Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/16428Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>

vcl/source/window/toolbox.cxx

@@ -5610,7 +5610,7 @@ void ToolBox::ImplShowFocus()
     if( mnHighItemId && HasFocus() )
     {
         ImplToolItem* pItem = ImplGetItem( mnHighItemId );
-        if( pItem->mpWindow )
+        if( pItem->mpWindow && !pItem->mpWindow->IsDisposed() )
         {
             vcl::Window *pWin = pItem->mpWindow->ImplGetWindowImpl()->mpBorderWindow ? pItem->mpWindow->ImplGetWindowImpl()->mpBorderWindow : pItem->mpWindow;
             pWin->ImplGetWindowImpl()->mbDrawSelectionBackground = true;