Looks like you've only added the functionality to the MusicPreview. If you want to put it in all previews, put the mouse_click handling in Preview::UpdateCoverArtImage.
It also looks like this is also part of the fix for https://bugs.launchpad.net/unity-lens-applications/+bug/1045230. I've linked it.
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Looks like you've only added the functionality to the MusicPreview. :UpdateCoverArt Image.
If you want to put it in all previews, put the mouse_click handling in Preview:
It also looks like this is also part of the fix for https:/ /bugs.launchpad .net/unity- lens-applicatio ns/+bug/ 1045230. I've linked it.