I've also noticed this occuring in Unity Web History Lens. Results using GIcons (bookmarks, using gtk-about) have a black background. Results using images (favicons from websites) don't. This may be an issue with Unity rather than the specific lenses.
I've also noticed this occuring in Unity Web History Lens. Results using GIcons (bookmarks, using gtk-about) have a black background. Results using images (favicons from websites) don't. This may be an issue with Unity rather than the specific lenses.