make wxKeyEvent could get unicode key under x11, add a x11 keysym--unicode char map tab

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/controls/radiobuttontest.cpp

@@ -73,6 +73,7 @@ void RadioButtonTestCase::Click()
     EventCounter selected(m_radio, wxEVT_RADIOBUTTON);
 
     wxUIActionSimulator sim;
+    wxYield();
 
     sim.MouseMove(m_radio->GetScreenPosition() + wxPoint(10, 10));
     sim.MouseClick();