Add a Approve button on the changed files of a merge request to know files already checked

I did a lot of merge requests and, sometimes, I do a merge request in different moments and, obviously, I forgot the already checked files.

I propose the addition of an "Approve" button on each changed file of the Changes section of a merge request, like this (e.g.):

and, after clicking the button, the change should be collapsed:

Of course, if someone pushes some change to an "Approved" file, the file should:

• return not approved (like in the first screenshot)
• show a custom warning, like this: