"Create merge request" doesn't allow use of existing branch

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Summary

On the issue detail page, if you've already created a branch and pushed commits to it, the "Create merge request" drop-down doesn't allow you to use that branch.

Steps to reproduce

1. Create an issue.
2. Create a branch whose name starts with the issue number, e.g. 123-fix-css-again.
3. Create one or more commits on that branch and push them to the GitLab remote.
4. Refresh the issue page. (Note that the branch you've pushed is detected as related to the issue.)
5. Click the "Create merge request" drop-down.

What is the current bug behavior?

The "Create merge request" drop-down gives you options of:

• "Create merge request and branch"
• "Create branch"

What is the expected correct behavior?

I expect to see an option of:

• "Use related branch", which would create a merge request from the existing branch which you've just pushed (which has already been detected and is displayed on the issue as a related branch).

Relevant logs and/or screenshots

Meme-annotated screenshot attached 🙂

Proposal

Allow user to use existing branch (user can type out branch name in dropdown as usual)