don't waste time updating state of tools in a hidden toolbar (patch 1612415)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44845 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/tbarbase.cpp

@@ -645,6 +645,10 @@ void wxToolBarBase::UpdateWindowUI(long flags)
 {
     wxWindowBase::UpdateWindowUI(flags);
 
+    // don't waste time updating state of tools in a hidden toolbar
+    if ( !IsShown() )
+        return;
+
     // There is no sense in updating the toolbar UI
     // if the parent window is about to get destroyed
     wxWindow *tlw = wxGetTopLevelParent( this );