iterm2 + kitty loses some alt keys

[steven807]

Basic information

zellij --version: zellij 0.41.1

stty size: 74 242

uname -av or ver(Windows): Darwin hostname 23.5.0 Darwin Kernel Version 23.5.0: Wed May 1 20:19:05 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T8112 arm64

iTerm2 version: Build 3.5.20241105-nightly

Description

• Run iTerm2 (with or without the recommended configuration that causes option to be sent as Esc+; with or without the configuration "Report keys using CSI u" enabled)
• Note that four alt keys, those associated with keys used for creating diacritics, Alt-E, Alt-I, Alt-U, Alt-N, do nothing.
• Note that the menu item Session/Terminal State/Disambiguate Escape is turned on.
• Turn off the above menu item, and note that it is now possible to use all the Alt keys.
• Disable support_kitty_keyboard_protocol, and restart. Note that things work as desired.

I don't know what the "right" solution is -- I don't know if this is a bug in zellij, iTerm2, termwiz, or something else. I do know that it took me multiple hours to identify the problem and a solution, so I at least wanted to provide this report in case others run into the same issue.

[dead10ck]

Can confirm, as of 4.41.1, alt key bindings no longer work unless support_kitty_keyboard_protocol is set to false.