Roboto-Regular contains non-white transparent pixels in resources

[peppy]

Just opening this issue in case someone runs into this in a future, so there is some documentation.

We expect all framework font resources to contain only opacity information. The Roboto resources go against this expectation. As it turns out, this is a non-issue due to the way RawCachingGlyphStore works (it will store only the relevant opacity channel, and remove these errors). This will only be visible when using the base GlyphStore.

As such I'm marking this as zero-priority - it doesn't need a fix unless a framework consumer runs into an issue. If anyone is bored/free enough to fix the resources, that is a valid solution.

Using RawCachingGlyphStore:

Using GlyphStore:

nb: this is unrelated to colour space investigation. something i noticed while working on a completely different issue.