Ali Mohammad Pur 417910fd28 Shell: Make escaping more intelligent ...

Instead of the previous only-escape-with-backslashes, extend the
escaping to one of:
- No escape
- Escape with backslash
- Escape with "\xhh" if control character that isn't easily represented
  as \X
- Escape with "\uhhhhhhhh" if unicode character that is too big to
  represent as "\xhh".

Fixes #6986.

2021-05-10 10:43:23 +02:00

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