see diff of commit on submodule in gitlab
### Description
I have a gitlab that is working totally fine when I work with normal repositories. However, I added a github submodule inside my gitlab project. On my repo, I did after commit and push ( git push --recurse-submodules=check ) and it worked perfectly.
But now, I can see my commit on gitlab, but the diff isnt displayed when I browse it on my gitlab with chrome. All the commits on files outside the submodules are well displayed meanwhile.
### Proposal
This feature had been implemented with Git 2.11 and its new git diff --submodule=diff . So we just need to provide this alternate diff in GUI
### Links / references
http://stackoverflow.com/questions/40895349/see-diff-of-commit-on-submodule-in-gitlab/40895712?noredirect=1#comment69027768_40895712
https://hackernoon.com/whats-new-in-git-2-11-64860aea6c4f#.nfz645r3j
issue