This is definitely a long awaited feature, many thanks for it. But it has some issues:
1. Dragging one tab over another to create a group barely works, it takes ambition to do it. Most of the time it will just make the tab underneath jump aside. The "collision" area needs to be way larger.
2. When succeeding in creating a group I'm being asked to pick a color, yet, when the tab group is collapsed the color changes. This is simply stupid, the group color needs to stay the same, otherwise it's useless, it might as well not be colored.
3. Pinned tabs cannot be dragged into a group. I see no reason why this shouldn't be possible.
4. Cannot drag a tab into an existing group unless the group is expanded. Maybe it has to do with issue no. 1?
