If you empty the trash, and that will cause folders to get deleted, we should warn the user (perhaps optionally, based on a pref). 4.x always warned the user. We should also warn if the user deletes a folder from the trash (I thought we did that, but it doesn't seem to be happening)

*** Bug 232573 has been marked as a duplicate of this bug. ***

add pref mail.imap.confirm_emptyTrashFolderDeletion, and prompt user for each top-level folder in trash that will be deleted. If user says no, we'll skip the folder, and if they say cancel, we'll skip the rest of the folders (we will still delete the folders the user said yes to).

I checked in a bustage fix (fixed the case of an #include), but you might want to back out your previous bustage fix, which seems wrong (QueryInterface and GetInterface should not be interchangeable, anyway).

marking fixed.

re-opening, new fix upcoming

we need to pre-flight the deletes, because the imap protocol code deletes the sub-folders when we delete all messages! And we can't pick and choose anymore; the previous patch just prevented the deletion of the folders in the ui.

fixed on trunk and m4 branch

It appears this confirmation is only available for IMAP, correct? Is there a reason the confirmation behavior is not considered desirable for POP accounts?