As per the latest mockups, the Details section is a toplevel
section, and not an actual subsection.
Remove all the code that implemented Details as a subsection,
and simply treat these panels as toplevel ones.
The panel swarms details/devices/privacy show this icon. Since the applications
panel is not made from sub-panels, this doesn't show. For consistency this shows
the icon so the transition isn't as jarring for the user.
Add a flat into the panel .desktop file to enable this - other panels might
require this in the future
When the panel list is folded, either the panel items list or the
panel itself is shown, not both. And when the list is shown it
doesn’t mean anything for an item to be marked as selected.
Instead of directly selecting the view that the panel
list will have, let it decide which is the previous
view instead.
This does not change anything functionality wise, but
in the future where we have sidebar widget (and thus
the main window does not control which view the sidebar
is display) this will be important.
This field can be used to communicate the visibility of the
panel from a static context (i.e. without any instances of
a CcPanel nor any access to CcShell).
