Suggestion/feature request: enable fixup commit instead of squash with option + drag

[swelborn]

It would be nice to be able to do something that MacOS does - enabling a different feature when holding down the option button (or maybe ctrl).

Instead of squashing a commit, we could hold option and it would fix up the commit (e.g., without changing the commit message of the squashee).

Something like this - sorry for bad image, but what I'm saying is "Squash" would turn into "Fixup" if option was held down:

[Byron]

Thanks a lot for sharing, I can see how that would be useful!

Also CC @PavelLaptev in case this could be relevant for future work.