I have Mattermost and GitLab running on the same server and I’m running/managing Mattermost separately from GitLab. I’m using the native linux client (v3.7.1) for connecting to Mattermost (4.4.2) and Chrome (62.0.3202.94) for accessing and manipulating GitLab on Fedora 27. For some reason if I click on a GitLab link in Mattermost (ex. https://example.com/group/project/merge_requests/1) it opens up a new tab in Chrome and redirects me to https://example.com/dashboard/projects/starred with a message at the top stating, “You are already signed in”. If right click in Mattermost -> Copy Link then paste that into a browser it works fine and does not cause an error.
Steps to reproduce
I’d expect that clicking on a link in Mattermost would not result in different behavior vs. copy/pasting the GitLab link in chrome.
Clicking on GitLab link in Mattermost causes opened tab in chrome to error out with “You are already signed in”