When a user creates a new Flow topic, we're currently putting two lines into all the logs -- one for creating the topic, and one for posting the first message.

This is an artifact from the days when users could create a topic without posting a first message. That has changed, and now it's just one action. The bug in watchlist + contributions that Helder reported is happening because the topic creation line isn't being suppressed.

The fix is: Suppress the redundant topic creation line -- the action of posting a new thread should be represented as a single action.

Originally filed as: Edited Flow titles shows the old title on Watchlist and Contributions pages

I renamed a topic but the change was not reflected on contributions and watchlist special pages. E.g.:
https://pt.wikipedia.org/w/index.php?title=Especial:Contribui%C3%A7%C3%B5es&dir=prev&offset=20150329182934&limit=2&tagfilter=&contribs=user&target=OTAVIO1981&namespace=&uselang=en