MacDue 2876e2f58e LibWeb: Fix border-radius corner overlap algorithm for zero-width boxes ...

Previously, the corner overlap algorithm implementation did not shrink
the border radii for zero width/height boxes, which resulted in
incorrect painting.

With this the implementation is updated to more closely follow the spec
steps, which naturally handles the zero width/height case. This makes
use of the `CSSPixelFraction` class for lossless comparison and
multiplication of the scaling factor for the radii.

Co-authored-by: Zaggy1024 <Zaggy1024@gmail.com>

2023-08-30 20:36:27 +02:00

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