once this widget is visible, It should handle the focus of its children
and leave no option to the underlaying widgets to gain focus.
This is implemented by making it a redirect when it gets visible.
This touches Edje and also Elementary where part names are used.
This commit blew up in size since now all content part APIs
(get, set, unset) require to use Efl.Part instead.
This is a big refactoring commit, but no logic should
have been changed. Fingers crossed.
This removes the conflicts between the different parents and also
indicates that this is to be used internally by widgets and should
not be confused with the normal user visible parent.
It is an internal attribute that should not be used by people
not implementing widgets. Marking it as protected signifies it
as such.
Marcel Hollerbach
Jean-Philippe Andre
Daniel Kolesa
Stefan Schmidt
Tom Hacohen
Cedric BAIL