Add a "Cancel" Button to the window when entering the name/ saving a Smart Playlist from a smart filter

Feature description:

A “Cancel”-Button unambiguously displays in connection with the “Save” button that there are two possibilities when naming/ saving a smart playlist from a smart filter. The current visible options are only to save the current playlist, although you can still cancel the operation by pressing anywhere outside the currently opened window.

Brought benefits:

Adding the button shows a visible possibility to cancel the operation.