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

include/wx/evtloop.h

@@ -198,4 +198,32 @@ private:
     wxEventLoop *m_evtLoopOld;
 };
 
+#if wxABI_VERSION >= 20808
+class wxEventLoopGuarantor
+{
+public:
+    wxEventLoopGuarantor()
+    {
+        m_evtLoopNew = NULL;
+        if (!wxEventLoop::GetActive())
+        {
+            m_evtLoopNew = new wxEventLoop;
+            wxEventLoop::SetActive(m_evtLoopNew);
+        }
+    }
+
+    ~wxEventLoopGuarantor()
+    {
+        if (m_evtLoopNew)
+        {
+            wxEventLoop::SetActive(NULL);
+            delete m_evtLoopNew;
+        }
+    }
+
+private:
+    wxEventLoop *m_evtLoopNew;
+};
+#endif // wxABI_VERSION >= 20805
+
 #endif // _WX_EVTLOOP_H_