--use a different shadows manager for dialogs such as
dock settings window through the Latte::Corona class.
The new shadow manager is responsible to draw
"dialogs/background" shadows for windows instead of
the PanelShadows original class which is responsible
to draw "widgets/background" shadows
--secondary config window now follows the primary
config window design. Config windows now are just
simple windows !AboveAll and are activated from
Latte::View on demand. This way we can now have
demonstration of the parabolic effect during
editMode at all times
--to make things even more robust the dock settings
window width is made a portion of the dock settings
window height. The code was also checked in order to not
create any bindings loops
BUG: 396872