Due to the many widgets in the panel, some enter and leave signals get
eaten up by some widgets here and there, so their ::enter-notify-event
should be connected to to make sure the cursor is still over the
panel. ::leave-notify-event isn't required as the panel will always
give us a reliable final leave event.

The reason why these signals are signalled or not signalled are not
fully understood.

This will get a redesign soon but until it comes let's at least make
the grid usable.

The desktop_ready() request (added in version 2) must be called after
everything is drawn to the screen so weston knows when to fade up and
show the desktop.

So that it doesn't choose the x11 backend when DISPLAY is set,
e.g. when running weston on x11 or when xwayland is available.

Require gtk+ 3.10 for this.

To workaround old libgnome-desktop not exporting that symbol.

To avoid conflicts with weston's weston-desktop-shell.

We're not using it.

Name our project weston-gtk-shell instead of weston. Fixes
tarball names.

The app info may have changed so always take the new app info
to update the hash table.

Fix a few bugs in our shell-app-system code that are exposed
by this change.

The other way doesn't work for some reason.