[Left/RightShift + <key>] not picked up by get_keys on wayland

[bhavyakukkar]

When pressing the Left/Right-Shift key first, followed by any other key, the set of keys down returned by get_keys only contains the Left/Right-Shift key on the wayland build.

This is a program to demonstrate the issue:

use minifb::{Key, Window, WindowOptions, KeyRepeat};

fn main() {
    let mut buffer: Vec<u32> = vec![0; 200*200];
    let mut window = Window::new("", 200, 200, WindowOptions::default()).unwrap();

    window.limit_update_rate(Some(std::time::Duration::from_micros(16600)));

    loop {
        if window.is_open() {
            let keys = window.get_keys();
            if keys.len() == 2 {
                panic!("Received these two keys: {:?}", keys);
            }

            window
                .update_with_buffer(&buffer, 200, 200)
                .unwrap();
        }
    }
}

This program,

• when run with only the 'x11' cargo feature:

does panic when LeftShift+L (LeftShift then L) is typed (desired behavior)

thread 'main' panicked at src/main.rs:13:17:
Received these two keys: [L, LeftShift]

• when run with only the 'wayland' cargo feature:

does not panic when LeftShift+L (LeftShift then L) is typed (undesired behavior)

I have tested:

• both builds on two wayland-compositors: sway & dwl (letting the compositor infer & start an xwayland server for the X11 builds)
  The problem only occurs in the wayland builds, i.e. the program does not panic on the wayland builds.
• the X11 build on two xorg window-managers: dwm & bspwm
  The problem does not occur, i.e. the program does panic.

Additionally,

• I tried both the latest crates.io version (v0.25.0) and git version (latest commit 29af982) of minifb

$ rustc --version
rustc 1.76.0 (07dca489a 2024-02-04) (Void Linux)

[emoon]

Thanks for the report