From code review of https://gerrit.wikimedia.org/r/c/mediawiki/extensions/DiscussionTools/+/708713, we decided that these issues are not blockers:
A couple of problems with activating the "Add topic" tab (adding 'selected' class in ReplyLinksController):
- The "Create source" tab should be deactivated, like the "Read" tab
- (In fact, should "Create source" tab even be activated when the page loads with our empty state? That's probably a core bug…)
- The "Add topic" tab should be activated when clicking the custom button too – I think this is actually a pre-existing issue in my code affecting all extra buttons, but I only noticed now
Test instructions
- Go to a non-existent talk page
- "Create source" tab should not be active
- "Create source" tab should not be active
- Click the "Start a discussion" button
- "Add topic" tab should be active
- "Add topic" tab should be active
