add wxAppConsoleBase::DeletePendingEvents and wxEvtHandler::DeletePendingEvents.

Fix wxAppConsoleBase::Suspend/ResumeProcessingOfPendingEvents: locking the mutex does not prevent wxAppConsoleBase::ProcessPendingEvents from running if the mutex was locked from the main thread!

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59433 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -2864,7 +2864,6 @@ public:
     // Event queuing and processing
     // ----------------------------
 
-
     // Process an event right now: this can only be called from the main
     // thread, use QueueEvent() for scheduling the events for
     // processing from other threads.
@@ -2900,9 +2899,11 @@ public:
     void ProcessPendingEvents();
         // NOTE: uses ProcessEvent()
 
+    void DeletePendingEvents();
+
 #if wxUSE_THREADS
     bool ProcessThreadEvent(const wxEvent& event);
-        // NOTE: uses AddPendingEvent()
+        // NOTE: uses AddPendingEvent(); call only from secondary threads
 #endif