It also looks like tmux is receiving incorrect width and height values. Notice the line duplication here:

Or, independent of tmux, look at what I get when I simply run htop:

Hmm, I can't repro after tmux and resizing both dimensions of the window rapidly. Could you try update to latest and try again? I pushed a massive update to xterm.js yesterday but it didn't appear to be published to the apt repo.

Same happens on macOS in 9c5d505. 😢

A simple resize makes it happen.

Running out of master:

1. Open terminal
2. htop
3. Resize terminal

I can repro on mac 👍

Oh it doesn't repro on today's insiders. 😕

😕

Weird, I'll still have a look when I get a chance.

What the. The issue seems to have returned today!

I know @sandy081 hits it too.

Yeah, I saw it yesterday and today (after update) I can't reproduce.

@Tyriar Let me know if I can help somehow. This morning it was broken for a while... and somehow it was fixed when I alt-tabbed into it. Once I reloaded, it was broken again. So weird.

I'm forced to go back to an external terminal. 😢

I see the issue again in today's insiders. It is random.

I spent an hour or 2 on it yesterday and struggled to reproduce.

Something that would help diagnose: If you happen to reproduce it (ideally out of sources), break where it's throwing which is here:

https://github.com/sourcelair/xterm.js/blob/bfdc468d4bc823b242ada286c7e8ecc7978f2b72/src/Renderer.ts#L142-L145

It would be good to see what the following values are:

• y
• this._terminal.buffer.ydisp
• this._terminal.buffer.ybase
• row
• this._terminal.buffer.lines.length

I think I found the problem - PR out in xtermjs/xterm.js#923

Upstream issue: xtermjs/xterm.js#924