Improve task manager tooltip media player controls and preview
- Remove album art in favour of actual window content preview
- Always show window title, even when media is playing
This change makes it much easier to use when we have multiple windows of one app, and one of them is playing media. Previously since they all used album art as the thumbnail and didn't even indicate the title, the windows were all indistinguishable.
Requests for this change from users: https://old.reddit.com/r/kde/comments/lou60a/why_is_plasma_521_showing_the_same_preview_on/, and https://old.reddit.com/r/kde/comments/lrjnb1/consider_removing_media_control_on_the_iconsonly/, and even more threads.
Here's how the tooltips look after the change:
