Not all features reported by ot_layout_language_get_feature_tags() due to 24 max

[justvanrossum]

uharfbuzz/src/uharfbuzz/_harfbuzz.pyx

Line 524 in e9b86bd

cdef unsigned int feature_count = 24

Also ot_layout_script_get_language_tags():

uharfbuzz/src/uharfbuzz/_harfbuzz.pyx

Line 545 in e9b86bd

cdef unsigned int language_count = 24

And ot_layout_table_get_script_tags():

uharfbuzz/src/uharfbuzz/_harfbuzz.pyx

Line 563 in e9b86bd

cdef unsigned int script_count = 24

This is the root cause of justvanrossum/fontgoggles#63

Funny thing: I just noticed this limitation in uharfbuzz a couple of days ago and wondered when we'd see a real-world report, and here we are :)

I'll try to write a fix.

[khaledhosny]

If mallocing is not desired, one can keep looping until there are no more items to get. Here is an example https://github.com/ufyTeX/luaharfbuzz/blob/master/src/luaharfbuzz/face.c#L98-L119

[justvanrossum]

Thanks, that's exactly the approach I had in mind.