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/list.h

@@ -1277,4 +1277,15 @@ public:
         (list).clear();                                                      \
     }
 
+// append all element of one list to another one
+#define WX_APPEND_LIST(list, other)                                           \
+    {                                                                         \
+        wxList::compatibility_iterator node = other->GetFirst();              \
+        while ( node )                                                        \
+        {                                                                     \
+            (list)->push_back(node->GetData());                               \
+            node = node->GetNext();                                           \
+        }                                                                     \
+    }
+
 #endif // _WX_LISTH__