Allow .patch to be appended to any Compare URL

Gitlab currently supports getting a patch from any MR by appending .patch to the URL. An example. The problem/feature here is that the patch evolves as commits are pushed to the source branch. This request is for .patch to work for any two references than can be Compared. So, a Compare URL with .patch appended would work. An example would be https://gitlab.com/drupalspoons/webmasters/-/compare/d1a6e292159f148a7869300b32d18d457179218c...master.patch

Developers, Sysadmins

Quickly get the code representation thats needed.

No new security concern. There URLs should work exactly like requests without .patch appended.

.patch is not currently documented AFAICT. I'm happy to write the docs if this proposal is accepted.

Github has this feature. An example.

Edited May 19, 2020 by Moshe Weitzman