Mangled text in Helix when unicode is involved

[chtenb]

What Operating System(s) are you seeing this problem on?

Windows

Which Wayland compositor or X11 Window manager(s) are you using?

No response

WezTerm version

20230828-220414-99c96139

Did you try the latest nightly build to see if the issue is better (or worse!) than your current version?

Yes, and I updated the version box above to show the version of the nightly that I tried

Describe the bug

I've attached an asciicast where you see me open a file in Helix, copy text from that file to the system clipboard and paste it back into the file. This is a reliable way to trigger the issue if the copied text contains unicode.
In the second asciicast I move to that same section in the file and open+close an overlay. This also triggers the issue.

This issue only occurs in Helix+Wezterm. Helix+WindowsTerminal and Vim+Wezterm both do not exhibit this behavior.

hx-wezterm-clipboard-paste.cast.txt
helix-open-overlay.cast.txt

To Reproduce

Install Helix+wezterm on windows and open a file with unicode. Play around with it like in the asciicasts.

Configuration

no config

Expected Behavior

No response

Logs

No warnings/errors in the logs

Anything else?

No response

[wez]

Maybe related to:

• Improve compatability of unicode grapheme width #4223