This is an interesting corner case, thanks for pointing it out, could you tell me some applications which are meant to be working in this way? I guess in this case we could handle it via quick menu, just a thought.
For example, Firefox. My mom used to have a panel launcher that she would use to open new windows (she's old school and not much of a tab person), and ironically she can't use the new launcher for that.
In this specific example, a solution could be that Mozilla makes the buttons to open a new window, or open a new tab, more visible. It's important to draw a line from the responsabilities of the software and the operating system, and of course weight these corner cases.
Is this the problem you are trying to solve with your "window spread"?
�Well, I think I brought up several cases where having the spread was handier, but that would be the main problem to solve, yes. That was my favourite feature from the task list, and the launcher seems to have lost it.
I think it's something worth investigating. Thanks for share it with us.�
Best, chr