I suggest giving Groupy the ability to automatically tab windows that are in the same position and are exactly the same size. This would, for example, be true for windows that are put in the same zone when using PowerToys' FancyZones. The suggested behavior would be as follows:

- Put two windows in the same zone

- Detect that two windows have the same position and size

- Reduce height of foreground window for tab space

- Put windows in a tabbed group

For a third window coming on top, the new size with the tabs would have to be taken into consideration.

For fast detection of size and position matches, listening for the usual FancyZones activation triggers could be used.