Sets the relief style of the edges of the given gtk.Button widget.
Two styles exist, GTK_RELIEF_NORMAL and GTK_RELIEF_NONE.
The default style is, as one can guess, GTK_RELIEF_NORMAL.
The deprecated value GTK_RELIEF_HALF behaves the same as
GTK_RELIEF_NORMAL.
Sets the relief style of the edges of the given gtk.Button widget. Two styles exist, GTK_RELIEF_NORMAL and GTK_RELIEF_NONE. The default style is, as one can guess, GTK_RELIEF_NORMAL. The deprecated value GTK_RELIEF_HALF behaves the same as GTK_RELIEF_NORMAL.