auto-name playlist should work when using drag-n-drop

[rumly111]

Steps to reproduce the problem

1. Create a new empty playlist (File -> New playlist)
2. Navigate to music directory in the OS file manager
3. Drag 1 directory into the new playlist
4. The playlist isn't renamed, still "New Playlist (1)"

What's going on? Describe the problem in as much detail as possible.

The option Auto-name playlists when adding a single folder is obviously enabled.
If I use File -> Add Folder(s) the renaming works. But not with drag-n-drop.
I think it used to work for drag-n-drop, but that might be just my wishful thinking.
If it used to work and not anymore, please fix the bug.

Information about the software:

Deadbeef version: 1.9.6
OS: Manjaro