Gitsigns change_base <branch_name> not setting the correct rev

[Summon528]

Description

When running :Gitsigns change_base <branch_name> I expect Gitsigns to show the difference between the current file and the version that's on the tip of <branch_name>. However, it seems like Gitsigns is adding a ^ to the end of the revision string, thus causing unexpected diffs. Instead of comparing against, for example, master, Gitsigns is comparing against master^

Here's the code and the commit that's adding the ^, everything works as expected if I remove the ^ but I'm not sure if it's there to serve some other purposes.

gitsigns.nvim/lua/gitsigns/manager.lua

Line 479 in 1ef74b5

local staged_rev = git_obj:from_tree() and git_obj.revision .. '^' or 'HEAD'

47c8e3e

Neovim version

NVIM v0.10.1

Operating system and version

openSUSE Tumbleweed 20240901

Expected behavior

After doing the reproduce steps, no git change line should be shown.

Actual behavior

A git change indicator was shown

Minimal config

for name, url in pairs{
  gitsigns = 'https://github.com/lewis6991/gitsigns.nvim',
  -- ADD OTHER PLUGINS _NECESSARY_ TO REPRODUCE THE ISSUE
} 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, -- You must add this to enable debug messages
  -- ADD GITSIGNS CONFIG THAT IS _NECESSARY_ FOR REPRODUCING THE ISSUE
}

-- ADD INIT.LUA SETTINGS THAT IS _NECESSARY_ FOR REPRODUCING THE ISSUE

Steps to reproduce

1. mkdir gitsigns_issue
2. cd gitsigns_issue
3. git init
4. echo 1 > file
5. git add file
6. git commit -m 'commit msg'
7. git switch -c branch
8. nvim --clean -u minimal.lua file
9. :Gitsigns change_base master

Gitsigns debug messages

9659.55 D cli.run: Running action 'change_base' with arguments { "master" }
9659.60 D run_job: git --no-pager --no-optional-locks --literal-pathspecs -c gc.auto=0 --git-dir /home/xxx/gitsigns_issue/.git -c core.quotepath=off ls-tree master /home/xxx/gitsigns_issue/file
9661.29 D run_job: git --no-pager --no-optional-locks --literal-pathspecs -c gc.auto=0 --git-dir /home/xxx/gitsigns_issue/.git show d00491fd7e5bb6fa28c517a0bb32b8b506539d4d
9663.12 D run_job: git --no-pager --no-optional-locks --literal-pathspecs -c gc.auto=0 --git-dir /home/xxx/gitsigns_issue/.git show master^:file

Gitsigns cache

No response