collapsing width of /iogonek in Mogra
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Description
Something is strange in the `/iogonek` of [Mogra](https://fonts.google.com/specimen/Mogra), as mentioned in #187 in [this comment](https://github.com/google/fonts/issues/187#issuecomment-453066431). It appears to have no width when used in Chrome/Firefox, but does have a width in the TTF file. I'm not quite sure what is causing the issue, but I wanted to document it.
When tested [in CodePen](https://codepen.io/thundernixon/pen/bzVepj?editors=1100) on Chrome or Firefox, the `/iogonek` has no advance width:
_However,_ the problem is not present in Safari:
Stranger still, in the [horizontal metrics table (HMTX)](https://docs.microsoft.com/en-us/typography/opentype/spec/hmtx), `/iogonek` has a positive width value of `385`, as expected:
...and it shows a positive value (with no global negative kerning) in RoboFont and GlyphsApp:
If anyone knows where an issue like this might be lurking, it seems like it should be simple enough to fix. I'd be interested to learn what might be causing this, too!
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