Gitlab supports many keyboard shortcuts, which can be seen listed here.
Leaving a non-review comment on a merge request is a frequent operation for me, but it used to be quite inefficient. Previously I had to scroll down to the bottom of a merge request page, bring my mouse cursor into the bottom comment box, click into it, type out the comment, move the mouse cursor again to the Submit button and click it.
Now with keyboard shortcuts it can be done like this: Press
r in a merge request page - the page is automatically scrolled down and your cursor is placed in the comment box. Now type out the comment. To submit, press
Tab once - the keyboard focus is on the Submit button. Press
Enter to submit the comment.
So, the workflow can be done without mouse now:
r -> Type comment ->