lok: remove ext text event re-entrancy hazard.

Change-Id: I7566c158330bab77589d422c61c64210727ab835
Reviewed-on: https://gerrit.libreoffice.org/73625
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

vcl/source/window/winproc.cxx

@@ -1137,6 +1137,12 @@ static bool ImplHandleExtTextInput( vcl::Window* pWindow,
         }
         if( !pChild->ImplGetWindowImpl()->mpFrameData->mnFocusId )
             break;
+
+        if (comphelper::LibreOfficeKit::isActive())
+        {
+            SAL_WARN("vcl", "Failed to get ext text input context");
+            break;
+        }
         Application::Yield();
     }