DND'ing a single tab to itself closes it
@egmontkob
Submitted by Egmont Koblinger Link to original bug (#763718)
Description
Have a g-t window with a single tab and a tab bar (requires "tab-policy: always").
Drag it, and drop it on top itself (either on the tab bar, or on the terminal).
The terminal closes.
Interestingly it does not crash; it closes cleanly without effecting the rest of g-t. Still, it shouldn't do this.
Version: git master