msg: consider the width of wide unicode characters

[guidocella]

Integrating wcwidth from https://github.com/rmyorston/busybox-w32/blob/master/libbb/wcwidth_alt.c allows clearing the correct number of lines when they wrap because of characters that span 2 cells. It can also be exposed to scripts later.

We considered using the system wcwidth only on Unix, but it only works if you set a locale.

[github-actions[bot]]

Download the artifacts for this pull request:

Windows

• mpv-i686-w64-mingw32
• mpv-x86_64-w64-mingw32
• mpv-x86_64-windows-msvc

macOS

• mpv-macos-12-intel
• mpv-macos-13-intel
• mpv-macos-14-arm

[sfan5]

Honestly this very much looks like a "not worth it" situation to me.

[avih]

Honestly this very much looks like a "not worth it" situation to me.

+1

[guidocella]

Superseded by #14894.

[kasper93]

Superseded by https://github.com/mpv-player/mpv/pull/14894.

To complement on that. The new PR https://github.com/mpv-player/mpv/pull/14894 is filling the gaps that were missing in this one:

• Accessible script to generate the code directly and be able to update it by ourselves, instead using pregenerated one
• Implement tires for unicode codepoints lookup
• Improves classification of more complex grapheme clusters, the new algorithm is following UAX #29

I'm open for other proposals in form of fully featured PR that are better.