
Rather than defining the space to the left and right of buttons, add a simple spacing property that defines the space between buttons, which is what GTK+ does for client-side decorations (e.g. GtkButtons in a GtkBox). Unfortunately the value is hardcoded in GTK+; if it is exposed in the theme in the future, we should pick it up from there, but for now we just use the same value as GTK+. https://bugzilla.gnome.org/show_bug.cgi?id=741917
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