tree 16e9211bf37e0915119b636bc06dad2e968de6d6
parent 7886b1578fceee368ae5afe206ff98f50e1c42e3
author Behdad Esfahbod <behdad@behdad.org> 1548349945 +0100
committer Behdad Esfahbod <behdad@behdad.org> 1548349945 +0100

[AAT] Use a ring buffer for ligature stack

I think Apple does very similarly, but probably with a stack size of 16.
We do it with a stack size that is currently set to 64.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1531