Nightly tarball build not properly concealing help text

[mikesmithgh]

Problem

The nightly tarball build of Neovim is not properly concealing text. I am noticing the first character is concealed properly but the last character is visible in help files.

For example, given the following text with the filetype help and a conceallevel set to 1, 2, or 3.

`test`
|test|
*test*

It displays as

test`                                                                                                                              
test|                                                                                                                              
test*                                                                                                                                    

I am able to reproduce this on both the nvim-macos.tar.gz and nvim-linux64.tar.gz.

I build Neovim locally from source on MacOS and do not have this issue. So, it appears to be specific to the tarball build.

Additional context:
I run nightly (actually every 3 hour) tests on my plugin kitty-scrollback.nvim. This uses the github action rhysd/action-setup-vim to download the nightly tarball of Neovim.

Test failures started for me on Mar 18, 2024, 2:16 AM EDT.

See test failures here.

Steps to reproduce

• curl -L -o nvim.tar.gz https://github.com/neovim/neovim/releases/download/nightly/nvim-macos.tar.gz
• tar xvfz nvim.tar.gz
• cd nvim-macos/
• VIMRUNTIME= ./bin/nvim --clean
• insert the text |hi|
• run :set filetype=help

Results in the visible text:

hi|

Expected behavior

Expected the visible text:

hi

Neovim version (nvim -v)

NVIM v0.10.0-dev-2637+g400ef8aaa

Vim (not Nvim) behaves the same?

n/a

Operating system/version

macOS Version 14.2.1 (23C71)

Terminal name/version

kitty 0.33.0

$TERM environment variable

xterm-kitty

Installation

Tarball linux or macos nightly build

[zeertzjq]

Fixed by #27934

[mikesmithgh]

confirmed it is fixed 👍