Can setqflist() consider the changed base?

[delphinus]

Is your feature request related to a problem? Please describe.

setqflist() can throw diffs into qflist but the diffs are not changed after I call change_base() and setqflist() again.

Describe the solution you'd like

setqflist() should consider the base changed by calling change_base(). This is so useful in reviewing PRs, I think.

" show diffs after HEAD
Gitsigns setqflist
" change the base to main
Gitsigns change_base main true
" show the whole diffs against main
Gitsigns setqflist

Describe alternatives you've considered

nothing

Additional context

vim-fugitive has the similar feature: Git difftool {revision}