Create a new gravity attribute.
pangoAttrGravityNew(gravity)
gravity
[PangoGravity] the gravity value; should not be PANGO_GRAVITY_AUTO.
PangoGravity
PANGO_GRAVITY_AUTO
Since 1.16
[PangoAttribute] the newly allocated PangoAttribute,
PangoAttribute
Derived by RGtkGen from GTK+ documentation