Commit subjects starting with vim: cause an error when running :G

[zivarah]

Description

I've noticed that on certain branches, :G shows an error referencing modelines and then some word from the subject of a commit that will show in the status buffer. It seems to occur whenever the message starts with vim:, which is a prefix I use (akin to conventional commits) in my dotfiles repo when making a change to anything vim-related.

The error message is:

Error detected while processing modelines:
line    6:
E518: Unknown option: pin
Press ENTER or type command to continue

where "pin" is the word after the : in the subject.

Minimal configuration

vim.env.LAZY_STDPATH = ".repro"
load(vim.fn.system("curl -s https://raw.githubusercontent.com/folke/lazy.nvim/main/bootstrap.lua"))()

require("lazy.minit").repro({
  spec = {
    {
      "tpope/vim-fugitive",
      config = function() end,
      commit = "0444df68cd1cdabc7453d6bd84099458327e5513",
    },
  },
})

Steps to reproduce

1. Set up a git repo and branch that will show a commit with the subject "vim: pin which-key to v2.1.0" when viewed in the status buffer:

   git init --initial-branch=main repro
   cd repro
   git commit --allow-empty -m "initial commit"
   git switch -c feature main
   git branch --set-upstream-to main
   git commit --allow-empty -m "vim: pin which-key to v2.1.0"
   

2. Run nvim -u <path-to-minimal-config> from the reproduction repo

3. Run :G, the error should show

4. Press enter and see that the status buffer does still load (though I have issues with bindings afterwards)

Details

The error only seems to occur when the status buffer is not currently visible, and only when the message starts with vim:. For example, if I change the message in the above reproduction to omit the : (vim pin which-key to v2.1.0), the error no longer occurs. If I change it to just vim: a, the error still occurs. If I change it to nvim: a, the error does not occur again.

The status buffer does still load, but it seems that the various custom bindings I have for the status buffer are not applied.

Specs/setup

OS: MacOS Sonoma 14.6.1
Fugitive: 0444df6 (Use nvim vim.ui.open as a fallback, 2024-07-18)
Git: v2.46.0
Vim: Neovim v0.10.1

Also reproduced in NixOS 24.05 with Neovim v0.9.5 and git v2.44.1.

[zivarah]

A bisect shows that this issue was introduced by 8c8cdf4 (Use callback based workflow for status buffer, 2024-02-11).