Even before #2311, Shields has measured all badge text using 11px Verdana, which is the correct font for plastic, flat, and flat-square.
However the for-the-badge style uses 10px Verdana and bold 10px Verdana, and the social badge uses bold 11px _Helvetica_. This causes these badges to be wider or narrower than they should be, and the text to be stretched accordingly.
Since the for-the-badge style relies on synthetic letter spacing (we just multiply the computed length in code) there is room to massage this further. Our test badges all look as good or better than before, so I think it should not block merging this, however we might need to get it right before the downstream problem in squint goes away. (There's also #4691 which this doesn't attempt to address.)
Fixes#4275
af3f720113