penguinolog / urwid / 37016981947

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Harden Edit against text leaks and control input

A masked Edit exposed its text outside the rendered canvas, and
the input filters let through characters that break layout or
conversion:

- Edit repr shows the masked text and the mask instead of the text.
- insert_text_result keeps the text out of its ValueError when masked.
- valid_char refuses Unicode control characters (Cc) and DEL bytes,
  which render as "?" but count as zero columns.
- IntEdit refuses a digit that would take the text past
  sys.get_int_max_str_digits(), so value() can convert what the user
  typed.

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