clutter-media: mention the asynchronous behavior of set_playing() in the doc.
clutter-media: mention the asynchronous behavior of set_playing() in the doc.

Depending on the ClutterMedia implementation, the set_playing()
call can be asynchronous, the playing state's change being not
immediate.

https://bugzilla.gnome.org/show_bug.cgi?id=650675

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