So I got a repro by following these steps:
- browse to a topic and click the reply button to open the composer
- start creating a reply
- duplicate the tab (you can do this by right clicking on a tab)
---- NEW STEPS - click on forum logo
- click on a other topic
- composer should show with your previous reply
- click the composer’s reply button (at this step you should still be on the duplicated tab)
You should see something like this:
