Add an option to separate windows by pages in WindowList

[yotamN]

Describe the new feature

When showing a WindowList by default it will separate the items by desk, but it's not possible to do separate the items by page.
It can be useful when showing a WindowList for only the current desk.

How might fvwm3 need to change?

There should be an option to separate the items by page, I'm not sure if it makes sense to use this feature without the CurrentDesk option.

Can this be achieved through scripting?

I'm not sure, I have not experience with scripting but I guess if the script can have access to the windows and pages information and it's possible to create a WindowList dynamically it would be possible.

I don't know of any window manager that have this feature because most of them don't have pages + desks but Openbox for example have separator between each workspace.