Missing "buffer-size" on some layers cause web-gl rendering issues

[nyurik]

(adding buffer-size="4" by hand into XML fixed the issue, but this should be done in yaml and with proper buffer size)

Seems that mapnik-generated tiles have bigger geometries than the allowed buffer size. I suspect this is the reason for lots of vertical & horizontal lines when drawing non-closed lines:

Shows "Geometry exceeds allowed extent, reduce your vector tile buffer size" warning in the browser console.

Similar issue with some good discussion

[nyurik]

Exactly the same problem reported in mapbox/mapbox-gl-js#2854

[nyurik]

Ok, figured it out - some layers simply do not have "buffer-size" parameter, thus causing maximum value to be supplied. This in turn causes the data to exceed (probably off by one) the value that's allowed in WebGL. Adding buffer-size="4" directly to the boundary XML fixed the problem. @pnorman not sure what the proper value should be for each layer.