An MR can only be resolved in the UI if:
- It has conflicts.
- It has valid diff_refs (in other words, it supports new diff notes).
- It has no conflicts with one side missing.
- It has no conflicts in binary files.
- It has no conflicts in files too large to display.
- It has no conflicts containing invalid conflict markers.
- Preloading noteable we share the same noteable instance when more than one
discussion refers to the same noteable.
- Any other call to that object that is cached in that object will be for any
discussion.
- In those cases where merge_request_diff has all the sha stored to build a diff_refs get that
diff_refs using directly those sha instead accessing to the git repository to first get the
commits and later the sha.
