Tweak to have windows show tracebacks.

IPython/frontend/wx/console_widget.py

@@ -175,6 +175,7 b' class ConsoleWidget(editwindow.EditWindow):'
             current_time = time.time()
             if current_time - self._last_refresh_time > 0.03:
                 wx.Yield()
+                #    self.ProcessEvent(wx.PaintEvent())
                 self._last_refresh_time = current_time 
 
    

IPython/frontend/wx/wx_frontend.py

@@ -320,7 +320,8 b' class WxController(ConsoleWidget, PrefilterFrontEnd):'
     def show_traceback(self):
         start_line = self.GetCurrentLine()
         PrefilterFrontEnd.show_traceback(self)
-        wx.Yield()
+        self.ProcessEvent(wx.PaintEvent())
+        #wx.Yield()
         for i in range(start_line, self.GetCurrentLine()):
             self._markers[i] = self.MarkerAdd(i, _ERROR_MARKER)