Glitch on uppercase "D" when size is under 148, in Chrome 71 on macOS 10.14

[amio]

Describe the bug
Uppercase “D” has a little glitch when size is under 148, in Chrome (71)

To Reproduce
Steps to reproduce the behavior:

1. Go to Inter UI font homepage
2. Checkout the shape of uppercase "D"

Screenshots

Environment

• OS: macOS 10.14
• App that renders the font: Chrome 71 (Only in Chrome. Safari & Firefox renders correctly)
• Version of font: index-var.css?v=20181015155019

[rsms]

This happens since the "D" is composed of two shapes and the rasterizer used by Chrome in this case doesn't perform a boolean union or there's a bug in Chromium (or Skia or Freetype or Harfbuzz.) Essentially it applies anti-alias to each shape instead of the compund shape, which is the expected outcome.

It may be worth filing this issue with Chromium at https://bugs.chromium.org/p/chromium/issues/list

In the meantime, I'm adding a work-around where overlapping shapes are removed via boolean union operations for specific glyphs.

[rsms]