When you're in the detail page for a pull request with the width of the window limited, the Files Changes and Commits tabs disappear.
@pingou Any specific reason why "hidden-sm-down" class applied to comments and Files changed ? I guess this is reason behind this.
I don't know :)
@pingou Could you please assign this to me ?
Metadata Update from @vivekanand1101: - Issue assigned to akasurde
Commit 8bdceeb1 fixes this issue