This feature may not be worth much, but it's kind of interesting. I haven't seen it mentioned before.
I just discovered, quite by accident, that the mailbox drawers in Mail app, which can slide out to either left or right, will slide in either direction when dragging and dropping a mail message from one box to another.
Drag a mail message from the main window to the left, and the mailbox drawer slides out to the left. Drag it to the right, and the mailbox drawer slides out to the right.
If you can move your mouse quickly enough back and forth, you can create a visually interesting phenomenon.
I just discovered, quite by accident, that the mailbox drawers in Mail app, which can slide out to either left or right, will slide in either direction when dragging and dropping a mail message from one box to another.
Drag a mail message from the main window to the left, and the mailbox drawer slides out to the left. Drag it to the right, and the mailbox drawer slides out to the right.
If you can move your mouse quickly enough back and forth, you can create a visually interesting phenomenon.