[Bug 247464] [PATCH] Add support for IUTF8 tty input mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247464

            Bug ID: 247464
           Summary: [PATCH] Add support for IUTF8 tty input mode
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: maximl at mm.st

Created attachment 215847
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215847&action=edit
Patches to the kernel, stty utility, and corresponding man pages

Fixes bug #220009. Both GNU/Linux and macOS have support for the removal of
UTF-8 multibyte letters when IUTF8 Input Mode is set through stty(1). Some
userspace software also assumes that this flag is available on the target
platform.

The patch adds basic support for such an Input Mode.
It doesn't make combining letters work, nor does it fix problems with line
width when there are multibyte letters in the line; these fixes would take
quite many changes. Nonetheless, it improves things a bit. :)

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