DRAFT scale: include all views visible on workspace

[mntmn]

Intuitively, "scale" should include all views that are visible in (overlap with) the current workspace, not only those that are mostly inside of it.

[ammen99]

@soreau Thoughts?

By the way, if we change the behavior as you propose, the whole function can be replaced with a single call:

output->wset()->get_views(wf::WSET_EXCLUDE_MINIMIZED | wf::WSET_MAPPED_ONLY | wf::WSET_CURRENT_WORKSPACE);

EDIT: this is with some changes which recently landed, this syntax wasn't available when you made the PR.

[NamorNiradnug]

I think the behavior should be configurable to allow users to choose between old and new behavior.

Probably it should hide away views which region overlaps only a little with the region of the current workspace.