View show or hide column headers doesn't work. Top row moves up behind headers, headers are not removed.
Just found out that if I click on the headers then I can then get them to disappear. Behaviour not the same as 3.17.8. This can be closed as I can workaround it.
If I then scroll down the email list the headers flash on and off.
Seems to be an upstream problem. According to the docs, gdk_window_show() and gdk_window_hide() do opposite things, but the former works and the latter doesn't. Perhaps it won't be solved until bug #4344 and its summaryview equivalent are completed.
This will be fixed when bug #4344 is completed. *** This bug has been marked as a duplicate of bug 4344 ***