This helps take cruft out of the uiGroup, and ensures that components remain
stacked properly on top of each other. In the future, we'll use this group
to ensure that grabs are ordered properly, as well.
Without special-casing, our current spacing calculation results in
negative size requests for empty lists, which will trigger a Clutter
assert later.
While the list is never supposed to be empty, bugs happen; crashing
users' systems is the least graceful way of handling this, so don't
do it.
https://bugzilla.gnome.org/show_bug.cgi?id=722434
Currently we only show/hide the left and right arrows when
we reach the initial/end position. This patch changes this
behaviour by showing the arrows whenever is a scroll is possible.
https://bugzilla.gnome.org/show_bug.cgi?id=711467
destroy() checks if we are visible to decide whether to destroy the
actor immediately or after a fade out animation. Since actors are
visible by default it would always end up destroying only after the
animation time.
https://bugzilla.gnome.org/show_bug.cgi?id=691963
Due to limitations and bugs in SpiderMonkey's GC, wrapper objects
for cairo contexts and similar may not get cleaned up immediately
after repainting, leading to leaking memory. Explicitly disposing
of such objects after they're not needed can clean up large portions
of memory for cairo surfaces.
https://bugzilla.gnome.org/show_bug.cgi?id=685513
