DF font rendering causes artefacts when glyphs are composed of multiple vector shapes

[8bitskull]

Font consisting of multiple vector shapes:

Same font, with boolean union to form a single shape:

See this forum post for detailed writeup of the issue:
https://forum.defold.com/t/issues-with-df-fonts/63744/7

[FlexYourBrain]

To clarify issue a bit :

When creating distance field fonts in defold, if the provided font has glyphs that have line segment intersections from multiple shapes or line segments intersecting with themselves. These intersections are visibly drawn to the font texture. Making it seem like visual artifacts.

The non defold solution: Is to clean up all the fonts glyph line segment intersections before bringing it in defold.

[JCash]

The problem is this assumption, which doesn't work with multiple paths that intersect:
https://github.com/defold/defold/blob/dev/com.dynamo.cr/com.dynamo.cr.bob/src/com/dynamo/bob/font/DistanceFieldGenerator.java#L37