Wrapper for actors inside a layout manager
<clutter-layout-meta>
is a wrapper object created by
<clutter-layout-manager>
implementations in order to store
child-specific data and properties.
A <clutter-layout-meta>
wraps a <clutter-actor>
inside a
<clutter-container>
using a <clutter-layout-manager>
.
<clutter-layout-meta>
is available since Clutter 1.2