[cairo] cairo_line_to bug (probably)

[calmar]

hi all.

http://www.calmar.ws/tmp/cairo.png  with version cairo-1.4.12

It's about the same with cairo-1.5.6.tar.gz so.

so, it draws several times to (19 - 16) = 3, what works normally
(the red line is in the box)

But when I draw to a point, and sharply back, and sharply forward
again (sharpely = the x offset is just 1), it seems to 'overdraw'
or so.

Cheers
calmar

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