I’ve started noticing this about a week or so ago. I’ve yet to get a consistent repro - but it seems to occur after editing a topic (as TL3 here on Meta, or Moderator at Stonehearth).
On a topic that can scroll, moving down (go to a later post) then back up resolves it. On a topic without scroll, I have to refresh the page to resolve it.
Has anyone else seen this?
Edit: just made a ninja edit to fix a typo, got the bug in this very topic!
EDIT: To explain a little bit how I tracked the bug:
I tried reproducing and found out that it actually reproduces by changing a topic’s title.
I found out that there are two events that control the header and if the topic title is shown or not: header:show-topic and header:hide-topic.
Searched where header:show-topic is triggered and found a match when a topic is reloaded (which happens when a topic is edited).
I changed the code to trigger header:show-topic only if the the topic title is not visible (not the one from the header, but the proper one, #topic-title).