Added double newline after file upload markdown insert

What does this MR do?

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #28511 (closed)

Needs test

added 1 commit

• 5fa93471 - Added double newline after file upload markdown insert

Compare with previous version

UX: @dimitrieh FE+test: @alfredo1

assigned to @alfredo1

unmarked as a Work In Progress

@lbennett i tested it out, but there maybe something wrong with my gdk: https://gitlab.slack.com/archives/questions/p1487763917008796

and when uploading multiple files i still get this result:

Interesting, looks like its appending the subsequent attachments before the newlines.

This is because of some complicated selection logic, will take a look.

assigned to @lbennett

Works now

assigned to @alfredo1

added 1 commit

• 9f322f2b - Added double newline after file upload markdown insert

Compare with previous version

What happened to the images on this MR :/

@alfredo1 Looks like a global issue

@lbennett LGTM I wish we didn't have to use sleep but I see we are using that previously. Hopefully we can find a way to get rid of those sleep later.

merged

resolved all discussions

@alfredo1 Yah, I figured it's because the dropzone.js library uses vanilla XMLHttpRequest for ajax. Looks like we do need to monkeypatch it in the test environment then.

Opened https://gitlab.com/gitlab-org/gitlab-ce/issues/28612