Delete open document and Next unread functions

To reproduce:1) Open mail file where there are many unread documents.

  1. Open first unread mail

  2. To delete mail press the “Delete” button on the keyboard.

3a - Sometimes the opened mail is not deleted. But when I close it, it immediately disapears from Inbox.

3b - Sometimes I should click the mouse somewhere in the document and press the “Delete” button on the keyboard again.

  1. To go to the Next Unread Document I press F4. In previous versions I used TAB that also works now and more useful but is not documented and doesn’t work fine everytime. F4 works more stable but very often when it’s used with Delete it jumps over a next unread document.