Forming a new tab group occasionally grows beyond the bounds of the window

[christopherliu]

I've only been able to reproduce this intermittently but it has been consistent for at least the past month.

1. Ctrl-Shift-F
2. Drag a tab from group 0 to an empty space that is right of the center of the browser window.
3. The newly created tab group is extremely tall, taller than the browser window.

I have noticed that, once the bug stops happening, I can't get it to come back without restarting, but am not sure what combination of behaviors causes the bug to cease.

• Windows 10
• 0.8.12
• Firefox 119.0.1

(If any of you out there are lucky enough to get a reproducible case please post here!)