Complex text shaping

[mikemorris]

Breaking this out from https://github.com/mapbox/gl-ported-maps/issues/20#issuecomment-43928958

Text shaping has moved client-side with switch to glyph ranges instead of augmented vector tiles, so complex text is no longer being shaped properly.

Proper text shaping:

Currently backwards, and without complex text shaping:

[mikemorris]

Useful info on HarfBuzz API design https://mail.gnome.org/archives/gtk-i18n-list/2009-August/msg00025.html

[mikemorris]

Long, possibly useful thread on Mozilla integration of HarfBuzz https://bugzilla.mozilla.org/show_bug.cgi?id=449292

[fnicollet]

I am also interested in this fix. I produce vector tiles with hebrew text only in Israel and users have been complaining that the text is reverted

[mikemorris]

-> mapbox/DEPRECATED-mapbox-gl#4

[jimmont]

Hebrew labels look like nonsense until you realize they're flipped is there a solution I can implement now to resolve this for my gl-js map?