
Dash items are currently animated via the custom "childScale" and
"childOpacity" properties. However since commit efb3025d8c
, those
properties actually control the scale-x/scale-y and opacity properties
of the actor itself (not the child), so cut out the intermediate
custom properties in favor of the "real" ones.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/22