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This is useful for adding other surfaces to an existing layer, like
adding the clock and app launcher to the panel's layer.

At the moment there's a problem where weston_view->output_mask for the
app launcher window isn't updated during the animation of moving it
onscreen. While offscreen ->output_mask is obviously 0 but during the
animation the correct output should be added to the mask.

To workaround this problem for now we'll keep the window always
onscreen but hidden by the panel so this problem is never hit. This is
a horrible hack and should be fixed properly as soon as possible.

Now we have a LICENSE file we don't need this one.

Use this to stop showing static times for both clocks.

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.