Unable to blame_line in earlier snapshots of a file

[Iskustvo]

Description

After using Gitsigns show ... to open specific snapshot of a file, Gitsigns blame_line doesn't work correctly on that snapshot. It often just pops up Not Committed Yet window, instead of actually blaming the line.

Neovim version

NVIM v0.10.0

Operating system and version

Arch Linux (x86_64) Kernel: 6.9.2-arch1-1

Expected behavior

Gitsigns blame_line actually blames lines in older file snapshots.

Actual behavior

For some lines (both changed and unchanged by current snapshot), it just shows Not Committed Yet window, instead of actual commit.

Minimal config

for name, url in pairs{
  gitsigns = 'https://github.com/lewis6991/gitsigns.nvim'
} do
  local install_path = vim.fn.fnamemodify('gitsigns_issue/'..name, ':p')
  if vim.fn.isdirectory(install_path) == 0 then
    vim.fn.system { 'git', 'clone', '--depth=1', url, install_path }
  end
  vim.opt.runtimepath:append(install_path)
end

require('gitsigns').setup{
  debug_mode = true
}

Steps to reproduce

1. Create testing environment

mkdir gitsigns_test
cd gitsigns_test
git init
echo -e "aaa\nbbb\nccc" > file
git add file
git commit -m "add 3 lines"
echo -e "aaaa\nbbbb\nccc" > file
git commit -am "modify first two lines"
echo -e "aaaa\nbbbbb\ncccc" > file
git commit -am "modify last two lines"

2. Open test file with minimal Neovim config

nvim --clean -u minimal.lua file

3. Show file snapshot of parent commit (modify first two lines)

:Gitsigns show HEAD^

4. Observe correctly drawn "signs" on first two lines, indicating that this commit really changed the first two lines.
5. Blame the first line (aaaa) in order to see who introduced it.

:Gitsigns blame_line

6. Observe correct popup window claiming that commit modify first two lines introduced it.
7. Navigate to second line (bbbb) which was introduced by the same modify first two lines commit.
8. Blame the second line (bbbb) in order to see who introduced it.

:Gitsigns blame_line

9. Observe incorrect Not Committed Yet popup, instead of modify first two lines.
10. Navigate to third line (ccc) which wasn't modified by this commit.
11. Blame the third line in order to see who introduced it.

:Gitsigns blame_line

12. Observe incorrect Not Committed Yet popup, instead of initial commit add 3 lines.

Gitsigns debug messages

No response