Freeze when ligature addon

[SquitchYT]

Details

• Browser and browser version: electron v11.5
• OS version: ArchLinux
• xterm.js version: 4.16

Steps to reproduce

1. Add ligature addon
2. Set the font to something that accept ligation (Fira Code for example)
3. The app freeze indefinitely without error

[SquitchYT]

This issue is probably related to princjef/font-ligatures#23.
However, it is impossible to dispose the addon. Nothing happen when I use .dispose() and the ligature remains activated

[Tyriar]

Maybe related to crash in microsoft/vscode#139537 (comment)

[Eugeny]

@Tyriar I second @SquitchYT, the hang is inside font-ligatures and it happens for specific font files only.

[LabhanshAgrawal]

I'd opened princjef/font-ligatures#24 for this, yet to be merged though

[Tyriar]

Merged, figuring out how to release now 🙂