OS/2 fixes for this week.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11015 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/app.cpp

@@ -994,6 +994,16 @@ void wxApp::OnIdle(
     wxLog::FlushActive();
 #endif // wxUSE_LOG
 
+#if wxUSE_DC_CACHEING
+    // automated DC cache management: clear the cached DCs and bitmap
+    // if it's likely that the app has finished with them, that is, we
+    // get an idle event and we're not dragging anything.
+    if (!::WinGetKeyState(MK_LBUTTON) &&
+        !::WinGetKeyState(MK_MBUTTON) &&
+        !::WinGetKeyState(MK_RBUTTON))
+        wxDC::ClearCache();
+#endif // wxUSE_DC_CACHEING
+
     //
     // Send OnIdle events to all windows
     //