LShift makes LAlt's KeyCode None on Linux

[lukors]

Bevy version

b964024

Operating system & version

Pop!_OS 20.10 (Based on Bunutu 20.10)

What you did

Ran this code:

use bevy::{input::keyboard::KeyboardInput, prelude::*};

fn main() {
    App::build()
        .insert_resource(WindowDescriptor::default())
        .add_plugins(DefaultPlugins)
        .add_system(update.system())
        .run();
}

fn update(mut keyboard_input_events: EventReader<KeyboardInput>) {
    for event in keyboard_input_events.iter() {
        println!("{:?}", event);
    }
}

And then press Left Alt while holding Left Shift.

What you expected to happen

The console to print the following:

KeyboardInput { scan_code: 42, key_code: Some(LShift), state: Pressed }
KeyboardInput { scan_code: 56, key_code: Some(LAlt), state: Pressed }

What actually happened

The console prints the following:

KeyboardInput { scan_code: 42, key_code: Some(LShift), state: Pressed }
KeyboardInput { scan_code: 56, key_code: None, state: Pressed }

Additional information

I am unable to reproduce this bug on Windows.

[mockersf]

probably related to rust-windowing/winit#600