6 failures have already been noticed on HiDPI fractional scales on Windows (125% for instance) and an additional 2 failures are seen when using the new Marlin rasterizer.

The tests pass at 100% and 200% and the issue was previously diagnosed as being a test issue making assumptions about rendering that are only consistent at integer scales.  The changes to properly test the issues for fractional scales are not simple and so we have only been doing testing at integer scales currently.