macos: synthetic bold not working

[Gankra]

On my text stress test, the synthetic bold case doesn't seem to be working:

left: vanilla firefox
right: webrender-firefox

The html is (problematic parts are the ones with "basic" as the font):

<p style="font-weight: bold">
Lorem ipsum dolor sit amet, consectetur adipiscing elit,
<span style="color: rgba(0,0,0, 0.5)">
sed do eiusmod tempor incididunt ut labore et
</span>
<span style="font-family: &quot;basic&quot;">
dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex
</span>
<span style="font-family: &quot;basic&quot;; color: rgba(0,0,0, 0.5)">
ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
</span>
<span style="font-family: -apple-system, sans-serif">
velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident,
</span>
sunt in culpa qui officia deserunt mollit anim id est laborum.
</p>

"basic" is a font I'm loading from Adobe Edge Fonts which doesn't provide a bold variant.

[Gankra]

Confirmed this works fine on windows.

[Gankra]

(Is there a way to test synthetics in wrench?)

[lsalzman]

You just need to use synthetic-bold: true for wrench

[Gankra]

Seems to work in wrench, probably a gecko bindings issue? (might also be font-specific, idk)

[lsalzman]

If you disable WR, does that case work?

[Gankra]

Yes, the screenshot shows it working without wr.

[Gankra]

Bugzilled since it seems like a gecko issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1428874