Show related merge request in branches list and branch single view
When I have dozens of branches and only *some* of them are being handled in open (or closed?) merge requests, it is difficult to get an overview of which branches still have no merge request. You can even start a new merge request if you are not aware of an already open one. So my suggestion is: * In the "Branches" view switch the "+ Merge Request" button into "Open Merge Request" linking to a merge request that uses this branch. * In the single "Branch" view, do the same for this particular branch. In the "Compare" view there is already this feature! If I use the "+ Merge Request" button while there is already an open one, after filling the details and saving, I end up with the error "Validate branches Cannot Create: This merge request already exists: ["xxx"]". A bit frustrating. :) Maybe this issue has been reported already, but I tried hard to find it using the issue search (and google) and could not find anything about it yet.
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