SVG zero-length subpath does not render as a square

Created attachment 244765 [details]
Zero-length subpath as a star in Webkit nightly

A zero-length subpath should render as a square, but it renders as a star. Here's a W3C test case: http://www.w3.org/Graphics/SVG/Test/20110816/harness/htmlSVGWeb/painting-stroke-10-t.html

The attached screenshot shows how Webkit nightly renders it.

Here's another example: http://mcc.id.au/temp/2008/zero-path.svg

This is most likely related to bug 18356

Oops, looks like I attached an old screenshot. Only the lower one renders as a star in nightly.

[Nikos Andronikos]

I created a standalone test case on OS X using core graphics for http://mcc.id.au/temp/2008/zero-path.svg with the following code:

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, 0, 100, 100);
    CGPathCloseSubpath(path);

    CGContextBeginPath(context);
    CGContextAddPath(context, path);
    CGContextStrokePath(context);

It looks like Core Graphics is rendering the path at a 45 degree angle and a square is being created by another workaround in the WebKit code - therefore causing a star to be rendered.

[Brent Fulgham]

Safari, Chrome, and Firefox all agree on rendering for this test case. I don't believe there is any remaining compatibility issue.