Increasing "drawing-box"

[Sven Vermeulen <sven vermeulen ugent be>]

Hi,

How should I enlargen the "drawing-box" that embodies the object that gets
rendered? For the "Standard - Line" this box is defined by the two handlers
of the line itself. However, if I change the line to be able to house
"double" lines, parts of that double-line don't get rendered immediately. 

In fact, rendering this double line gives me stale, black "left-overs":
	http://studwww.ugent.be/~sjvermeu/dia-1.png
After redrawing (for instance by scrolling away and then back to the object)
the rendering is fine though:
	http://studwww.ugent.be/~sjvermeu/dia-2.png

The problem with the box is visible when i draw a double line straight up:
	http://studwww.ugent.be/~sjvermeu/dia-3.png
But after redrawing, it renders fine:
	http://studwww.ugent.be/~sjvermeu/dia-4.png

Wkr,
	Sven Vermeulen

-- 
    Save some animals, eat a vegetarian.

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