[PATCH][weston] ivi-shell: initialize all fields in create_layout_transition

[John-John Tedro]

I'm currently investigating.

I see two easy solutions, so please advice since I'm unfamiliar with
the requirements on IVI-based solutions.

1) Bail, easy and safe, but might not be desirable.

2) Immediately transition into the desired state on errors.
   Slightly harder, but doable.

Examples for 2):
ivi_layout_transition_move_layer would update the size and position of
the target surface.
ivi_layout_transition_visibility_on/off would immediately set the
surface to the requested visibility.

What do you think?

--
John-John Tedro
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