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/gtk1/app.h

@@ -38,7 +38,6 @@ 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);
@@ -71,6 +70,8 @@ private:
     bool m_isInAssert;
 #endif // __WXDEBUG__
 
+    virtual bool DoYield(bool onlyIfNeeded, long eventsToProcess);
+
     DECLARE_DYNAMIC_CLASS(wxApp)
 };