check in the 'selective yield' patch (see ticket #10320):

- implements YieldFor() with event filtering for wxMSW and wxGTK,
  adds TODO markers in other ports;
- replaces wxYield() in GTK's clipboard code with a wxTheApp->YieldFor() call, thus fixing possible reentrancies 
(and modifies clipboard sample to test synchronous IsSupported calls)
- replaces wxYieldIfNeeded() calls in wxProgressDialog with wxTheApp->YieldFor() calls, so that it processes only 
UI/user-input events, thus fixing the race condition visible in the "thread" sample
- documents the new functions


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58654 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/app.h

@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        wx/gtk/app.h
-// Purpose:
+// Purpose:     wxApp definition for wxGTK
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling, Julian Smart
@@ -40,7 +40,6 @@ public:
     virtual bool OnInitGui();
 
     // override base class (pure) virtuals
-    virtual bool Yield(bool onlyIfNeeded = FALSE);
     virtual void WakeUpIdle();
 
     virtual bool Initialize(int& argc, wxChar **argv);
@@ -79,6 +78,10 @@ public:
     bool EventsPending();
     bool DoIdle();
 
+protected:
+
+    virtual bool DoYield(bool onlyIfNeeded, long eventsToProcess);
+
 private:
     // true if we're inside an assert modal dialog
 #ifdef __WXDEBUG__