layout-manager: Do not emit layout-changed on thaw
layout-manager: Do not emit layout-changed on thaw

When thawing a LayoutManager, do not emit the ::layout-changed signal
since it might still be in the middle of a relayout.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2255

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