Certain escape sequences in quick succession break rendering.

Details

• Browser and browser version: Chrome Latest
• OS version: Linux
• xterm.js version: 3.13.2

Steps to reproduce

If you take the following escape sequences and run them in a fast loop nothing is rendered in the end.

      const lines = [
        '\u001b\u0063',
        '\u001b\u005d\u0030\u003b\u0020\u0007',
        '\u001b\u005b\u0048\u001b\u005b\u0032\u004a\u001b\u005b\u0031\u003b\u0033\u0033\u006d',
        'test test test',
        'lalala',
      ];
      for (let line of lines) {
        this.terminal.write(line);
      }

But if you make them run as a microtask it renders fine:

      var inter;
      inter = setInterval(
        () => (lines.length ? this.terminal.write(lines.shift()) : clearInterval(inter)),
        0
      );

The same script that contains these escape codes is run daily with thousands of users and it displays fine using an older version of xterm.js.

[agronick]

@jerch Good news! It definitely fixes it.

[agronick]

I just got home for the long weekend and I won’t have access until Tuesday. I’ll be sure to test it then. It is possible we are on an old version.

It is also possible we have the issue in production but most servers don’t output fast enough to cause the issue. Or that the users are seeing it but never reported it. Maybe they open and close the terminal until they get lucky and it works. I’ve never heard anyone mention it.