gtktextlayout: fix for right margin with RTL text
gtktextlayout: fix for right margin with RTL text

When a RTL paragraph is not set to wrap, the right margin is not respected
because of the margins counted twice so we replace
display->width by PIXEL_BOUND (extents.width), the same quantity
without the margins.

https://bugzilla.gnome.org/show_bug.cgi?id=741702

ahodesuka/gtk,jigpu/gtk,ahodesuka/gtk,chergert/gtk,Adamovskiy/gtk,davidgumberg/gtk,jadahl/gtk,davidgumberg/gtk,Lyude/gtk-,chergert/gtk,grubersjoe/adwaita,chergert/gtk,jigpu/gtk,Lyude/gtk-,ahodesuka/gtk,jigpu/gtk,jigpu/gtk,grubersjoe/adwaita,grubersjoe/adwaita,ahodesuka/gtk,chergert/gtk,Adamovskiy/gtk,grubersjoe/adwaita,jadahl/gtk,jigpu/gtk,Lyude/gtk-,Adamovskiy/gtk,alexlarsson/gtk,davidgumberg/gtk,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita,jigpu/gtk,ahodesuka/gtk,grubersjoe/adwaita,Lyude/gtk-,Adamovskiy/gtk,ahodesuka/gtk,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,grubersjoe/adwaita,davidgumberg/gtk,jigpu/gtk,Adamovskiy/gtk,grubersjoe/adwaita,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,Lyude/gtk-,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,Adamovskiy/gtk,jigpu/gtk,Lyude/gtk-,ahodesuka/gtk,chergert/gtk,jadahl/gtk,Lyude/gtk-,alexlarsson/gtk,Adamovskiy/gtk,ahodesuka/gtk,davidgumberg/gtk,jadahl/gtk,davidgumberg/gtk,chergert/gtk,chergert/gtk,Lyude/gtk-,jadahl/gtk,alexlarsson/gtk