penguinolog / urwid / 41057162018

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Send "menu" from Overlay for an unhandled Esc

Dialogs built as an Overlay all close on Esc by hand.
Overlay now sends "menu" when its top widget leaves a key for the menu command (Esc by default) unhandled:

- Handlers receive the overlay; one returning True consumes the key.
- Without a handler, keypress returns the key as before.
- The cascading menu tutorial closes its boxes through the signal, and the manual describes it.

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