--draggingStarted signals/slots were used in order
to handle the active window dragging from empty areas.
The new approach ungrabs the mouse properly through
View relevant function and at the same time sends a
QEvent::Leave event to inform applets that the mouse
has left the view. This is enough in order to remove
any older draggingStarted workarounds and hacks.
--when a vertical view is in busy state and is touching
also a horizontal view that is fully transparent in
SMART mode then the visual result is not that good.
In that case it is better to show the view background.
The horizontal view background in that case can provide
three different states:
a) if the panel style for popups is activated then the
horizontal view will follow the plasma original style
b) if NOT [a] and solid background for touching windows
is enabled then solid background will be offered
c) if NOT [a] and NOT [b] then the isBusy state
transparency will be offered
--View::WindowsTracker now provides all the time
information about CurrentScreen and AllScreens!
This way all consumers (Latte::Containment, Applets etc.)
can choose whatever suits them best.