[Bug] - web console wrongly echoes CSI escape sequences

[krobelus]

Describe the bug

The Web Console seems to fail to parse certain CSI escape sequences, and ends up echoing them.
This is unfortunate because it causes annoying glitches with programs like text editors and shells that use the kitty keyboard protocol

To Reproduce

1. In the web console run printf '\x1b[=5u'
2. See that 5u is echoed.

Expected behavior

Nothing should be echoed, since the string is a CSI-prefixed escape sequence

Additional context
Originally reported at fish-shell/fish-shell#10994

[stewartsmith]

Thanks for the report, I'll reach out to the internal team that owns the console is aware of the issue.

For clarification: are you finding this on "Get system log", "Get instance screenshot", EC2 Serial Console, or EC2 Instance Connect?

[krobelus]

For clarification: are you finding this on "Get system log", "Get instance screenshot", EC2 Serial Console, or EC2 Instance Connect?

I'm not sure; @munntjlx would know.

[munntjlx]

This is more of "incorrect terminal emulation on the web console"

[munntjlx]

instance connect

[stewartsmith]

Thanks, I've directed that team to this issue.