Annoyance footprint for "groupy tabbed" window changes from original window footprint

Groupy2 is amazing, ALMOST perfect.

The one constant annoyance I have with it, is that when I have a non-groupy window, placed just where I want it, and I "add" another window as a groupy tab... the groupy tab ends up taking up space above the original window placement, which often goes off my screen.

I would like it better if, when a groupy tab is added to a window for the first time (by dropping another window on it), the full-footprint of the new window+groupy tab was the same as the original window without the groupy tab.

Here is a video to demonstrate the problem:

https://youtu.be/ykmlk0m-FkE