WebPositive `border: dotted 1em` renders skew lines and breaks underline thickness

[thebuck]

Background info: Because app_server still does not expose dotted/dashed stroking API in interface kit, that dithering pattern is used. It could render 1px wide stroke perfectly...

But the border sides are canted.

And border: dotted 1em impacts underline thickness. However, outline: dotted 1em does not, neither do other border-styles.

[thebuck]

Little testcase

[madmax]

I had something unfinisehd for this before I started having problems to build haikuwebkit in my older computer. I'll try to find it and resurrect it during the week now that I have more memory.

The issue is that dotted and slashed borders (and maybe other non-solid styles) go through something different and in the end the start and end points for the function that draw each line are meant to be the corners of the rectangle for that line, not the middle points of the line edges.

[madmax]

Fixed in haikuwebkit 1.9.