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d177b20bab
Normally, when `ctrl+<character>` is pressed, such as `ctrl+z` or
`ctrl+c`, macOS (AppKit) doesn't do any key translation because that
doesn't map to any printable text on its own. Ghostty does the
translation to correctly determine the character is "z" or "c" or
whatever.
For some reason when the keyboard layout is "Dvorak - QWERTY Cmd"
specifically (_not_ plain "Dvorak") on a US layout keyboard, AppKit
decides that "ctrl+z" ("/" on a qwerty keyboard) translates to "/"...
I can't find any explanation for this.
To workaround this, this commit makes it so that if the following
conditions are true, then we IGNORE AppKit's text translation and
manually do it using UCKeyTranslate:
(1) We're on macOS specifically (not iOS, etc.)
(2) We have a key event with ONLY control pressed
This fixes `ctrl+z` on this unique Dvorak keyboard layout.