libkmpris: refresh player when track list changes

Fushan Wenrequested to merge
work/fuf/vlc into master

Reason for the change

For some players when the current track list changes, it doesn't list all changed properties in the PropertiesChanged signal from org.mpris.MediaPlayer2.Player. This adds a check for the track list so when the track list changes, the player information is refreshed.

Test plan

Screenshots or screen recordings

Bugs fixed

BUG: 490569 FIXED-IN: 6.1.5

Merge request reports