Only highlight crates/playlists when a single track is selected #2242
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Selecting multiple tracks creates a very inconsistent experience. Sometime crates and playlists get highlighted, sometimes not. It is not obvious why and how this happens when selecting more than 1 track.
The signal that a track is selected must only be sent if exactly 1 track is selected! Otherwise an empty track pointer is sent to indicate that no single selected track is available and all view changes are properly reset to the default state.
Detected while verifying this bug report: https://www.mixxx.org/forums/viewtopic.php?f=1&t=12368&p=42659