Track layouts per virtual desktop

[spiffytech]

Is your feature request related to a problem? Please describe.
I use different layouts on different virtual desktops, since each virtual desktop is dedicated to a different task.

Presently, KZones offers me the layout I last selected, regardless of which virtual desktop that happened on. So when I want to place a window I often have to re-select the layout I want first.

(And, of course, I often get that wrong on the first attempt because several of my layouts look similar (e.g., they're mirror images of each other), so working around this feels quite irritating.)

Describe the solution you'd like
I'd like each virtual desktop to remember the layout I last applied for it, and to not change based on activity on other virtual desktops.

Additional context
I'm also multi-monitor, so when I've enabled the setting to track layouts per screen, I want each (screen, virtual desktop) pair to act independently.