Diff between 2 git commits except contained in 3rd commit

[Dmitry Lysnichenko <dmitriusan apache org>]

Hi all,

Is there a way to get meld + git to display changes that happened between 2 git commits, but exclude changes introduced in a 3rd commit? The use case is to see how much current commit differs from some commit before a 3-way merge.

I understand that this is not a pure meld use case, but sounds like quite a common use case for me.

It would be great to have "arithmetic" mode like "meld path1 path2-path3" but sounds too fantastic to be true.

Thanks,

Dmitro