[ClutterText] Return 1 for min width when editable
[ClutterText] Return 1 for min width when editable

Editable ClutterText will scroll when allocated less width than is
necessary to lay out the entire layout on a single line, so return 1 for
the minimum width in this case.

Approved by Emmanuele Bassi, fixes bug #1555.

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