self.c.Render() at the end of HandleRender was there to schedule a gocui Update
tick so the view content modified above would actually get drawn. For UI-thread
callers (the great majority -- keybinding handlers, the layout function itself,
popup resize, etc.) this was unnecessary work, since gocui already runs a
layout/redraw cycle after every event. SimpleContext.HandleRender doesn't call
Render() either, so this aligns the two implementations.
The few callers that drove HandleRender from a worker goroutine and relied on
Render() for the flush were wrapped in OnUIThread in the preceding commits, so
the implicit Render is no longer needed.
Also, Render() being called *before* setFooter() looks like it might have been a
theoretical race; this is no longer an issue now.
Stefan Haller
76211eea68