Inconsistent virtual_keycode on macOS and OpenBSD

[afh]

While using alacritty on macOS and OpenBSD I notice a difference in the keybinding configuration, where some keybindings working on macOS are not working on OpenBSD.
The helpful folks in the #alacritty Libera.Chat channel pointed me to this repository and suggested that the issue that I run into might be related to a missing (platform) mapping in this repository, which alacritty uses as a dependency.

I modified the examples/resizable.rs in order to provide a Minimal Working Example (MWE) (see below).

Note that on OpenBSD I am using the us.swapctrlcaps keyboard layout, have assigned the physical Control left of the spacebar to Hyper_L using keycode 37 = Hyper_L in ~/.Xmodmap (this should not matter though as the tests below only use the Command key), and have swapped the left logo key with the left alt key in order to match macOS' layout where the left Command key is left of the space bar and the left Alt (Option) key is to the left of the left Command key resulting in: Alt Command Space

	OpenBSD	macOS
sw_vers -productVersion	—	11.6
uname -r	6.9	20.6.0
rustc --version	1.51.0	1.51.0

I've tested the MWE on both macOS and OpenBSD as follows:

• Place the Cargo.toml and src/main.rs files (see below) in a separate directory for testing
• Build and run the MWE: cargo build && ./target/debug/winit-key-test on macOS and OpenBSD
• Press the keys as shown in the table below and compare the output of the MWE on macOS and OpenBSD
• I would expect the following keycodes (also highlighted in bold in the MWE Keycode Comparison table below) to be the same across platforms:

Key(s)	OpenBSD	macOS
Shift + 8	Asterisk	Key8
Command + Shift + 8	Asterisk	Key8
Shift + [	None	LBracket
Shift + ]	None	RBracket
Command + Shift + [	None	LBracket
Command + Shift + ]	None	RBracket

Detailed MWE Keycode Comparison Between OpenBSD and macOS

Key(s)	OpenBSD	macOS
Command (Key left of the spacebar)	scancode: 56, keycode: None, modifiers: LOGO	scancode: 55, keycode: Some(LWin), modifiers: LOGO
Alt (Key left of Command)	scancode: 107, keycode: Some(LAlt), modifiers: ALT	scancode: 58, keycode: Some(LAlt), modifiers: ALT
Shift	scancode: 42, keycode: Some(LShift), modifiers: SHIFT	scancode: 56, keycode: Some(LShift), modifiers: SHIFT
8	scancode: 9, keycode: Some(Key8), modifiers: (empty)	scancode: 28, keycode: Some(Key8), modifiers: (empty)
Shift + 8	scancode: 9, keycode: Some(Asterisk), modifiers: SHIFT	scancode: 28, keycode: Some(Key8), modifiers: SHIFT
Command + Shift + 8	scancode: 9, keycode: Some(Asterisk), modifiers: SHIFT | LOGO	scancode: 28, keycode: Some(Key8), modifiers: SHIFT | LOGO
[	scancode: 26, keycode: Some(LBracket), modifiers: (empty)	scancode: 33, keycode: Some(LBracket), modifiers: (empty)
]	scancode: 27, keycode: Some(LBracket), modifiers: (empty)	scancode: 30, keycode: Some(LBracket), modifiers: (empty)
Shift + [	scancode: 26, keycode: None, modifiers: SHIFT	scancode: 33, keycode: Some(LBracket), modifiers: SHIFT
Shift + ]	scancode: 26, keycode: None, modifiers: SHIFT	scancode: 30, keycode: Some(LBracket), modifiers: SHIFT
Command + Shift + [	scancode: 26, keycode: None, modifiers: SHIFT | LOGO	scancode: 33, keycode: Some(LBracket), modifiers: SHIFT | LOGO
Command + Shift + ]	scancode: 27, keycode: None, modifiers: SHIFT | LOGO	scancode: 30, keycode: Some(LBracket), modifiers: SHIFT | LOGO

Minimal Working Example

Cargo.toml

[package]
name = "winit-key-test"
version = "0.1.0"
edition = "2018"

[dependencies]
winit = "0.25.0"

src/main.rs

// Adapted from examples/resizable.rs
use winit::{
    dpi::LogicalSize,
    event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::WindowBuilder,
};

fn main() {
    let event_loop = EventLoop::new();

    let mut resizable = false;

    let window = WindowBuilder::new()
        .with_title("Displaying KeyboardInput")
        .with_inner_size(LogicalSize::new(400.0, 200.0))
        .with_resizable(resizable)
        .build(&event_loop)
        .unwrap();

    event_loop.run(move |event, _, control_flow| {
        *control_flow = ControlFlow::Wait;

        match event {
            Event::WindowEvent { event, .. } => match event {
                WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
                WindowEvent::KeyboardInput {
                    input, ..
                } => {
                    if input.state != ElementState::Pressed {
                        return;
                    }
                    println!("scancode: {scancode:>sw$}, keycode: {keycode:?}, modifiers: {modifiers:?}"
                             , scancode=input.scancode, sw=3
                             , keycode=input.virtual_keycode
                             , modifiers=input.modifiers);
                }
                _ => (),
            },
            _ => (),
        };
    });
}

[afh]

Going through the list of existing issues it seems that this issue should probably be included in the Meta Issue: Keyboard input #1806 and is possibly related to No character getting received on international keyboard on macOS #1208.

[afh]

Thanks you so very much for addressing this! 🎉 I look forward to the next release of winit and update software (e.g. alacritty) using winit.