test-flow-layout: Use BindConstraints
test-flow-layout: Use BindConstraints

If we want to fit the FlowLayout to the Stage size we should use the
BindConstraint API instead of a watcher on ::allocation-changed.

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