Ensure that wxApp::Yield is always processing pending event by creating a

temporary event loop if needed.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@53607 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mgl/app.cpp

@@ -74,11 +74,10 @@ bool wxApp::Yield(bool onlyIfNeeded)
 
     wxLog::Suspend();
 
-    if ( wxEventLoop::GetActive() )
-    {
-        while (wxEventLoop::GetActive()->Pending())
-            wxEventLoop::GetActive()->Dispatch();
-    }
+    // A guarentee that there will be an active event loop:
+    wxEventLoopGuarantor dummyLoopIfNeeded;
+    while (wxEventLoop::GetActive()->Pending())
+        wxEventLoop::GetActive()->Dispatch();
 
     /* it's necessary to call ProcessIdle() to update the frames sizes which
        might have been changed (it also will update other things set from