On Windows 7, version 45.0.2552.635 (PGO) of Opera pins itself to my taskbar, even if I unpin it. Every time I launch Opera, Opera pins itself to the taskbar again. When I then close Opera, it remains pinned to the taskbar. And every time I unpin it, and every time I run Opera again, it pins itself to the taskbar again.
Is this a bug or a feature?