Mark regex matches break in neomutt

[PhrantiK]

Describe the bug

Regex matches on marks break within neomutt.

To Reproduce
Steps to reproduce the behavior:

1. Enable mark shortcut key:

map kitty_mod+0 toggle_marker regex 1 \bLD[0-9]{4}\b

2. fire up neomutt
3. Enable mark

Expected behavior

Regex matches seem to work fine for the first dozen or so matches but then break down and shift 16 chars.

Screenshots

working:

Further down:

Environment details
OS: Name and version of operating system(s)

Created a blank config with only the shortcut key above with same results:

kitty 0.19.3 created by Kovid Goyal
Darwin gtd.local 20.3.0 Darwin Kernel Version 20.3.0: Thu Jan 21 00:07:06 PST 2021; root:xnu-7195.81.3~1/RELEASE_X86_64 x86_64
ProductName:	macOS ProductVersion:	11.2.3 BuildVersion:	20D91
Loaded config files: /Users/hars/.config/kitty/kitty.conf

Config options different from defaults:
Changed shortcuts:
	shift+control+0 KeyAction(func='toggle_marker', args=['regex', ((1, '\\bLD[0-9]{4}\\b'),), re.UNICODE])

[kovidgoyal]

I'm going to need a better reproducer than that. Press ctrl+shift+h to view the screen in less and save the screen to a text file by pressing s in less. And post that text file, assuming the issue is producible with it.

[PhrantiK]

Is there a way I can send it through privately? There's information on there I would rather not share publicly.

Edit: Not sure if it helps but just pressing ctrl + shift h and reapplying the mark to the screen fixes it. It also matches fine applying the regex in a less search on the output file.

[kovidgoyal]

You can email it to me, my email address is at the top of most kitty source code files.

[kovidgoyal]

If the marking is failing only inside neomutt, then rather than using ctrl+shift+h run kitty with --dump-bytes and get to the point where the problem occurs and post the dump file instead.