Switching tabs on a playlist keeps your unsaved changes
Edits you have not saved on a playlist's Content tab now stay put when you switch to another tab of the same playlist and back.
Edits you hadn't saved on a playlist's Content tab were thrown away when you switched to another tab of that playlist, such as Schedule or Settings. Remove an item, check the schedule, come back, and the item was there again. Now the items you added, removed, or reordered stay as you left them until you save, whichever tabs you visit in between.
Leaving the playlist altogether still asks first, as it has since the unsaved content warning in 26.9.1.