VSFilter/GDI truncate font name to 31 characters

[moi15moi]

Problem

VSFilter/GDI truncate font name to 31 characters.

Currently, Libass doesn't emulated this behaviour. See: libass/libass#459
Since it doesn't emulated it, this won't be implemente until libass does.

Which test I did to know how GDI works.

All the test I did was with this font: A-Farzian-2-Regular.zip
I rename the font with different name to see what name GDI would return me:

from fontTools.ttLib.ttFont import TTFont

font = TTFont("A-Farzian-2-Regular.ttf")

names = [
    "a"*30 + "😋"
    "a"*31 + "😋",
    "a"*32,
    "😋" * 20,
]

for name in names:
    font["name"].setName(name, 1, 3, 1, 0x409)
    font.save(f"{name}.TTF")

[moi15moi]

Closed by #34
For more information, see: #22 (comment)