Changed Delete key behavior.
When I use the delete key to remove a message from the Thunderbird message list pane the message is not removed. I have to press the delete key twice for the message to be removed. This is not how it has worked. It also has the unwanted side effect of deleting the message from trash folder.
Hi Anonymous, and sorry to hear that you're running into this issue. From what I could dig up, this is a longstanding issue with Thunderbird that goes back at least a decade and has not yet been solved fully. Sometimes it's the delete key, sometimes it's other forms of deletion, but it always has a result similar to the one you described. The standard recommendation from Mozilla appears to be to delete and recreate your trash folder. I hope that works!