ClutterDropAction: Added "drop-cancel" signal.
ClutterDropAction: Added "drop-cancel" signal.

The drop-cancel signal allows the drop action to cleanup its
state if the can-drop signal is refused. This is especially
useful if the drop action (or its target actor) is managing
any drop target animations.

https://bugzilla.gnome.org/show_bug.cgi?id=675336

djdeath/clutter-android,ebassi/clutter,heysion/clutter-clone,heysion/clutter-clone,collects/clutter,GNOME/clutter,GNOME/clutter,djdeath/clutter,djdeath/clutter,jigpu/clutter,Distrotech/clutter,GNOME/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,heysion/clutter-clone,djdeath/clutter-android,Distrotech/clutter,ebassi/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter,kerrickstaley/clutter-vala,GNOME/clutter,Distrotech/clutter,ebassi/clutter,collects/clutter,heysion/clutter-clone,collects/clutter,kerrickstaley/clutter-vala,collects/clutter,ebassi/clutter,Distrotech/clutter,GNOME/clutter,kerrickstaley/clutter-vala,jigpu/clutter,jigpu/clutter,djdeath/clutter,kerrickstaley/clutter-vala,heysion/clutter-clone,djdeath/clutter,djdeath/clutter,Distrotech/clutter,djdeath/clutter-android,collects/clutter,djdeath/clutter-android,Distrotech/clutter