[cairo] Bug with large line width near edge of window?

[Matt Peterson]

So I recently added zoom/pan functionality to a DrawingArea being drawn
with cairo. Line width varies with zoom level. When the line width is
large, say, around 40, and the line is almost outside of the area, the line
appears distorted. Like the top and bottom corners of the twisted rectangle
move to the corners of the screen rather than well off the side of the
screen like they should be.

I can post a screenshot if necessary, but is this a known bug? Where should
I report it?

--
Matt Peterson
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