Show who else is reviewing a merge request

Problem to solve

When I am the author of a merge request and am waiting for someone to look at my merge request, I don't want to keep following up with Slack messages because they might be looking at it already, or mid way through a review. I don't know this because GitLab doesn't give me any feedback.

Further details

Proposal

If I am a Developer or above, and I am looking at a merge request, show me online indicators for other project members currently viewing the same merge request.

Mockup
clip-20191001T155553

Links / references

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