"terminal.integrated.macOptionIsMeta" does not bypass dead-keys in "ABC - Extended" keyboard layout

[d10c]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.83.1 Commit: f1b07bd25dfad64b0167beb15359ae573aecd2cc Date: 2023-10-10T23:57:32.750Z Browser: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Code/1.83.1 Chrome/114.0.5735.289 Electron/25.8.4 Safari/537.36
• OS Version: macOS Sonoma 14.0 (23A344)

Steps to Reproduce:

1. On macOS, switch to the "ABC - Extended" keyboard layout
2. In VSCode, turn on terminal.integrated.macOptionIsMeta
3. Open the integrated terminal
4. Type various key chords involving Meta, such as Meta+p/Meta+n for browsing through command history.
5. The outcome: the command line is intermittently littered with unapplied dead-keys, such as ,,˜,˜,,˜. In particular, this makes some terminal applications such as vanilla Emacs unusable.

In contrast, if you switch to another QWERTY keyboard layout such as "Unicode Hex Input", this problem does not appear. Ideally, "ABC - Extended" should be supported just as well.

[ulugbekna]

Hi @Tyriar , this seems like a terminal issue to me because I don't see the keybinding service handling these events & also macOptionIsMeta seems like an xterm option?