Resolves: tdf#118609 crash in calc after some manipulation through basic

Change-Id: I518b15359b29c845604d2e9cde64bdb637078ba1
Reviewed-on: https://gerrit.libreoffice.org/59052
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/ui/app/inputhdl.cxx

@@ -1896,7 +1896,7 @@ void ScInputHandler::SetInputWindow(  ScInputWindow* pNew )
 
 void ScInputHandler::StopInputWinEngine( bool bAll )
 {
-    if (pInputWin)
+    if (pInputWin && !pInputWin->IsDisposed())
         pInputWin->StopEditEngine( bAll );
 
     pTopView = nullptr; // invalid now