Freeze when pasting large text into vim (WSL) about terminal

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Open similar issues:

• pasting large multiline text is extremelly slow (#9232), similarity score: 0.79
• Pasting specific texts into vim (WSL) breaks some keys (#16655), similarity score: 0.78

Closed similar issues:

• Neovim often freezes when pasting in Windows Terminal (#13645), similarity score: 0.83
• Windows terminal randomly freezes with Neovim 0.6 in debian Bullseye when using MCTRL>-C or V (#11945), similarity score: 0.77

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[danielniccoli]

I can run killall vim on a different WSL tab, which kills the process, but it still stays unresponsive. You can't see that in the video, but before and after I run the killall vim command, I'm pressing esc, ctrl-c, ctrl-z, and some other keys in a-z and nothing happens.

After the killall vim you can see that some more text get's pasted into the terminal. I can't reproduce that always. It just happened to happen when I recorded it.

Recording.2024-03-26.232407.mp4

[lhecker]

Out of 10 tests I did manage to reproduce a freeze once. How often does this happen for you? Is this always reproducible? I did notice that if I SIGTERM vim my original tab still works. So I think it should either be a bug in vim, or we're failing to send some input to it and it's waiting indefinitely on that (for instance the end of the bracketed paste?).

[danielniccoli]

I can reproduce it reliably, always. SIGTERM ist ctrl-c, no? The terminal does not respond to ctrl-c or ctrl-z. It also freezes at random positions for the same text. I don't know what you mean by bracket.

[lhecker]

I can reproduce it reliably, always. SIGTERM ist ctrl-c, no?

No that's SIGINT. What I did is open a new WSL tab in parallel and run killall vim.

I don't know what you mean by bracket.

Bracketed paste is a technique with which the terminal can tell an application that the input comes from the clipboard (or similar) and not keyboard. For instance, in vim you may want automatic indentation when typing, but when pasting you may want it to be preserved as is. You can read more about it here: https://en.wikipedia.org/wiki/Bracketed-paste

[zadjii-msft]

Fascinating. That's an interesting repro for sure. Thanks for filing!