lok: avoid forcing expensive re-layout of the calc input bar.

This occured on doc_setView and was unreasonably expensive - loading and
de-compressing new PNGs as multiple users typed, re-sizing and
re-rendering a toolbar that is not visible -> do nothing here.

cf. cool#6893.

Change-Id: I1980a3a4516fb2aa629da85de9d4628f29de5af7
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156270

sc/source/ui/app/inputwin.cxx

@@ -1141,6 +1141,10 @@ void ScInputBarGroup::NumLinesChanged()
 
 void ScInputBarGroup::TriggerToolboxLayout()
 {
+    // layout changes are expensive and un-necessary.
+    if (comphelper::LibreOfficeKit::isActive())
+        return;
+
     vcl::Window *w=GetParent();
     ScInputWindow &rParent = dynamic_cast<ScInputWindow&>(*w);
     SfxViewFrame* pViewFrm = SfxViewFrame::Current();