Related: tdf#106872 amount of a11y selection listeners constantly grows

so it gets progressively slower

Change-Id: Ib53c69231c902d064b939be096e0dbeab2f0fc71
Reviewed-on: https://gerrit.libreoffice.org/40490Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/ui/Accessibility/AccessibleDocument.cxx

@@ -380,6 +380,8 @@ ScChildrenShapes::~ScChildrenShapes()
         if (pDrawBC)
             EndListening(*pDrawBC);
     }
+    if (mpAccessibleDocument && xSelectionSupplier.is())
+        xSelectionSupplier->removeSelectionChangeListener(mpAccessibleDocument);
 }
 
 void ScChildrenShapes::SetDrawBroadcaster()