Let's come back to the specifics of the initial message.
It seems that the issue only exists on the message view screen, and only for this "secondary" menu item, i.e. when the account's "delete method" is specifically not "delete permanently"
( when it is, it's a button in the button bar below )
Yes, correct.
The problem ("use" case) is as follows:
The item 'Delete permantly 'is usually located near the bottom of the "overflow" menu (see screenshot #1)
> if the user tries to scroll the list (e.g. one-handed) it is very likely that he will hit
accidentally the item 'Delete permantly'...then, surprisingly the "Undo-panel' appears - but times out quickly - the user will get in 'panic' - trying to hit the 'Undo-button' (remember: the device is in 'one-handed' use), but missed it and the message get lost... permanently.
How about this then:
Exclude this specific case of "delete permanently" from "undo"? Unconditionally (no setting)?
I mean just the "delete permanently" menu item in the overflow menu specifically of message view specifically?
This could be a solution (workaround?):
Move the setting 'Confirm when deleting messages' right below of the item 'Confirm' Mark all read' = excluding this case from "Undo".
However, I'm not sure if this solution would be sufficient for users who a) explicitly don't want to confirm , but b) instead need an undo function for this action.
That's the reason for my suggestion to add an (sub) option:
http://www.aqua-mail.com/forum/index.php?topic=4963.msg28729#msg28729