[Urwid] ui.stop & ui.start don't work as expected

[Ian Ward]

Iñigo Serna wrote:
> Problems found:
> - after entering shell cursor is not shown
> - after coming back to urwid app, besides a myapp_display() explicit
> call, nothing is shown in screen, this only happens after an event
> (f.e. key press), and then the colors (or header and footer of the
> fram in my sample app) are not shown

The attached patch seems to fix these problems for me.

Ian
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