[Geary] sent message threading

[Casey Stone <tcstone caseystone com>]

Hello ... I have another problem after the Fedora 29 package updated 
from v0.12.x to v0.13.3: threading of sent messages doesn't work very 
well.

If I reply to a message, the message I sent should shortly appear below 
the message I replied to. However, 20 minutes and a re-launch of Geary 
later, the sent message is not added to the thread.

If I then go to the 'sent' folder, the message does appear, threaded. 
Then if I return to the inbox the message now appears correctly (as it 
did in Geary v0.12.x).

Is there any change I need to make to my settings or is this another 
regression (like the folders all going 'open' on the left pane I 
mentioned before)?

Thanks.