SUMMARY When drag/dropping an email selection from the messages list and trying to move the emails to a folder that happen to contain a subfolder the Move/Copy dialog will not open. Using IMAP STEPS TO REPRODUCE 1. Create a folder containing a subfolder 2. Try to drag drop a message into this upper level folder 3. OBSERVED RESULT No dialog will open when hovering on the target folder name EXPECTED RESULT The normal Move/Copy dialog should open and the operation should be possible to do SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Mageia 8/Plasma 5.20.4 (available in About System) KDE Plasma Version: KDE Frameworks Version: 5.76.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION
Also just noted that a message under a forlder that has a subfolder cannot be deleted. Probably for the same reason. Seems like the creator of kmail has not considered that you can have a main folder with messages and then create a subfolder underneath this for certain other messages. But still keep most of the messages in the base folder. A very common way of organizing your messages for some people...