enter wxPendingEventLocker critical section in ProcessPendingEvents() (fixes 1720352)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46142 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/appbase.cpp

@@ -347,6 +347,8 @@ void wxAppConsole::ProcessPendingEvents()
     if ( !HasPendingEvents() )
         return;
 
+    wxENTER_CRIT_SECT( *wxPendingEventsLocker );
+
     // iterate until the list becomes empty
     wxList::compatibility_iterator node = wxPendingEvents->GetFirst();
     while (node)