Aryeh Gregor wrote:
For undoing, AFAIK we do rely on diff3, and I suspect undoing just always fails on Windows (although I might be wrong, never actually tried).
I think diff3 is used for edit conflict merging, not for undoing (but that could be also the case). There is a version of diff3 for Windows. The user would need to install it. There are also Unix like systems not providing Gnu diff3.