use wxEventLoop in wxApp under wxMSW; factored out common code from wxX11/wxMotif/wxMGL to wxAppBase; changed wxApp::Dispatch() return type

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23613 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/app.cpp

@@ -654,9 +654,9 @@ bool wxApp::Pending()
     return (::WinPeekMsg(vHabmain, (PQMSG)&svCurrentMsg, (HWND)NULL, 0, 0, PM_NOREMOVE) != 0);
 } // end of wxApp::Pending
 
-void wxApp::Dispatch()
+bool wxApp::Dispatch()
 {
-    DoMessage();
+    return DoMessage();
 }
 
 //////////////////////////////////////////////////////////////////////////////