[BUG] Track count lags one step behind reality

[sonofevil]

Describe the bug When I ctrl+drag tracks into an UI-only playlist, the track count is shown incorrectly. After dropping the tracks, the displayed track count is the one from before adding the tracks.

To Reproduce Steps to reproduce the behavior:

1. Ctrl+drag some tracks into an UI-only playlist.
2. Observe the wrong track count next to the playlist title.

Expected behavior Track count will always show the actual number of tracks in the playlist.

Screenshots

Desktop (please complete the following information):

• OS: EndeavourOS
• Browser: Wine browser
• Version: git clone latest

[regorxxx]

Fixed.