Okay, but can you give a more detailed explaination, please? Also, what is the issue that Groupy 1 had?
I am a fairly experienced software developer (20+ years) with a fair bit of experience in QA and have dabbled with the Windows API.
Sure. The same list for alt tab is also used by the taskbar and the virtual desktops but of course in slightly different ways. You end up with windows pinned to all desktops in virtual desktops in Groupy 1 but that logic doesn't then work right with combined taskbar buttons sometimes.
I think long term the best solution is definitely a custom alt tab window as that can then expose tabs in a more usable way.