penguinolog / urwid / 42793839241

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Add an unscripted ScriptedScreen for run_until_idle()

MainLoop.call_from_thread() needs a started loop, and a started loop on
ScriptedScreen() ended with ExitMainLoop at the first input feed, so
VirtualClockEventLoop.run_until_idle() could not serve its later alarms.

- ScriptedScreen(inputs=None) feeds no input and never ends the loop.
- get_input() of an unscripted screen returns an empty batch.
- The default inputs=() still ends run() at once.
- run_until_idle() and the testing manual show the started-loop use.

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