[Bug 220009] stty iutf8 not supported

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220009

            Bug ID: 220009
           Summary: stty iutf8 not supported
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rtc at helen.plasma.xg8.de

Linux has a stty setting iutf8. This is necessary for utf-8 locales for the
following reason:

When you enter a non-us-ascii utf-8 character in canonical mode (for example,
when cat > file is run on the shell command line) it will be two or more bytes
long. If you now hit the erase key (ie., backspace) only one byte will be
deleted from the input buffer. For example, if you input äü and hit backspace,
the input buffer will now contain two bytes of utf-8 code for ä and the first
byte of the utf-8 code for ü, for a total of three bytes, which are invalid.

The iutf8 flag tells the terminal that the input is in utf8 and that the erase
key in canonical mode should erase all bytes of the rightmost character.

FreeBSD should support iutf8 so that canonical mode works fine with utf8
locales.

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