Added wxFrameBase::OnMenuOpen, and wxUSE_IDLEMENUUPDATES in platform.h

Experimental wxUpdateUIEvent::SetUpdateInterval() function to limit
UI update frequency


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21746 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/evtloop.cpp

@@ -139,7 +139,11 @@ bool wxEventLoopImpl::SendIdleMessage()
 {
     wxIdleEvent event;
 
-    return wxTheApp->ProcessEvent(event) && event.MoreRequested();
+    bool processed = wxTheApp->ProcessEvent(event) ;
+
+    wxUpdateUIEvent::ResetUpdateTime();
+    
+    return processed && event.MoreRequested();
 }
 
 // ============================================================================