penguinolog / urwid / 36866805715

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Fix input parser crashes on crafted terminal input

Terminal input such as a paste could raise out of process_keyqueue and end
the main loop:

- A run of about 1000 ESC bytes exhausted the recursion limit; the first of
  three ESCs in a row is now decoded on its own.
- Text after "ESC [ <" that is not "Pb;Px;Py" plus M/m raised ValueError and
  was buffered without bound; it now decodes as ordinary keys, and a report
  body is capped at _SGR_MOUSE_MAX_LEN codes.
- ESC followed by a terminal report (DECRPM reply) raised AttributeError; the
  ESC is now kept as a separate key, which also drops the urwid.util import.

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