The current situation is somewhat sad, with the path
label totally misaligned throughout the rows.
This is fixed by using a size group for the path labels,
so they all have the same allocated size (with the max
of 15 chars). Also, instead of hiding the eject button,
set it child-invisible, so it is hidden and yet it's size
is allocated by GtkBox.
https://bugzilla.gnome.org/show_bug.cgi?id=757303
Since we're dealing with networks, terms like "Eject" or
the eject button are misleading, since we're not actually
ejecting but disconnecting.
Fix that by showing the appropriate icon and tooltip.
GtkPlacesView widget manages persistent locations,
factoring out GtkPlacesSidebar functionality.
It, however, does not completely shows all sidebar
locations, since Computer is still missing.
Add a Computer item, adjusting some internal behavior
to make that possible.
Places sidebar shows XDG directories, mounted and unmounted devices,
connected networks, bookmarks and actions like 'Connect to server'
and 'Insert location', which causes the sidebar to grow very quickly
and look cluttered. Because of that, new mockups for the sidebar try
to simplify it.
To make the sidebar simpler, the new mockups propose that it should
only handle connected networks and removable devices such as flash
drives and USB devices, and delegates other devices for external
widgets through the 'Other Locations' item.
To handle fixed devices and manage network connections, add a new
widget named GtkPlacesView, based on Nautilus mockups to keep
consistency between GNOME file management tools - in this case,
between Nautilus and the bundled Gtk's file chooser.
https://bugzilla.gnome.org/show_bug.cgi?id=752034
