use proposed popup borders from containments
This a solution in order for containments, docks,
panels to publish their preffered popups borders.
Containments are setting a dynamic property
called _containment_popup_borders
and plasmaquick
dialogs are checking it in order to be used in
case it is provided. A use case of course is Latte
dock that uses containments with parabolic effect
and in such case AllBorders might be better to be
drawn at all cases.