a GdkWindow
a state
type of shadow to draw
clip rectangle, or NULL if the output should not be clipped. [allow-none]
the widget. [allow-none]
a style detail. [allow-none]
x origin of the extension
y origin of the extension
width of the extension
width of the extension
the side on to which the extension is attached
Draws an extension, i.e. a notebook tab.