kmail: folders per KDE activity

Project:Linux software
Component:Documentation
Category:feature request
Priority:normal
Assigned:Unassigned
Status:active
Related pages:#222: Plasma activities
Description

Very similar feature request to #228: Bookmarks per KDE activity

When the kmail application is shown across several activities, it'd be nice to be able to associate some folders to specific activities, so that unrelated folders are somewhat hidden (but still easily accessible) according to the context.