Unable to add comment on large diff
I'm trying to add comments on my own MR on one the diffs, but when I click Comment, the comment is not added. No emails are sent out and nothing appears in the Discussion section either. The diff in question has a lot of changes - so much so that it says "Cannot display changes" unless I enable "Hide whitespace". If that makes any difference, I'm commenting on the changed lines. Commenting on other, smaller, diffs in the same MR works.
Steps to reproduce
- Submit MR with a large diff containing many whitespace changes.
- Make sure diff cannot be displayed with whitespace shown.
- Hide whitespace.
- Make sure diff is now displayed.
- Type in a comment on one of the changed lines.
- Click "Comment".
Adding a comment on an unchanged line of a diff often causes the same behavior (doesn't matter if the diff is big or small).
I have Firefox 55.0.2 64-bit, Ubuntu 16.04.
What is the current bug behavior?
Comment is not added after "Comment" is clicked.
What is the expected correct behavior?
Comment is successfully added.
Relevant logs and/or screenshots
Output of checks
This bug happens on GitLab.com.