Undo a reblame?

[joshuali925]

Hi, I'm trying out gitsigns blame instead of fugitive blame, but I didn't find a way to undo a reblame. For example, after a few reblames at commit parent, I realize I went too far and want to go back one step. Now I need to remember how many times I reblamed, close and reopen the blame, and reblame n-1 times.

Is there a better workflow to this? Would it be good if we can use <C-o> to undo the current reblame and go to the previous blame commit?

Relevant fugitive issue tpope/vim-fugitive#543