Tracks: inconsistent UI with hidden tracks

[ronso0]

Bug Description

• create a new crate, add some tracks
  -> crate label shows correct track count, is rendered bold if contained tracks are selected in other library features
• hide the tracks
  -> tracks are "removed" from crate, the label's track count is updated correctly
• go to Hidden, select these tracks
  -> crate label becomes bold
  so these tracks are still somehow contained in that crate
  BUT the counter is not considering them

I propose to make hiding from playlists and crates optional.

My use case:
I have many short recordings I don't want to see in the Tracks view, but rather have them organized in a 'Samples/rec' crate.

Version

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OS

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