urwid / urwid / 477

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Handle case where MainLoop._topmost_widget does not implement mouse_event

Code that passes mouse_events to child widgets check if the widget
implements the mouse_event() method, but this was not checked in
MainLoop.process_input(). This results in a crash. Minimal example:

    import urwid
    urwid.MainLoop(urwid.SolidFill("X")).run()
    # ...then click anywhere

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