return false from Dispatch() if gtk_main_quit() was called (patch 1864846)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51039 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/evtloop.cpp

@@ -112,7 +112,6 @@ bool wxGUIEventLoop::Dispatch()
 {
     wxCHECK_MSG( IsRunning(), false, _T("can't call Dispatch() if not running") );
 
-    gtk_main_iteration();
-
-    return true;
+    // gtk_main_iteration() returns TRUE only if gtk_main_quit() was called
+    return !gtk_main_iteration();
 }