xkb_state_update_mask does not correctly replicate server state

[mahkoh]

Consider the following application, using https://crates.io/crates/xkbcommon, that simulates the communication between a wayland compositor and a client using xkbcommon:

use xkbcommon::xkb::{
    Context, KeyDirection, Keycode, Keymap, State, KEYMAP_FORMAT_TEXT_V1, STATE_LAYOUT_EFFECTIVE,
    STATE_MODS_DEPRESSED, STATE_MODS_EFFECTIVE, STATE_MODS_LATCHED, STATE_MODS_LOCKED,
};

const KEYMAP: &str = r#"
xkb_keymap {
    xkb_keycodes {
        <shift> = 50;
        <a> = 38;
    };

    xkb_types {
        virtual_modifiers X = 0x200;
        virtual_modifiers Y = Shift;
        
        type "X" {
            modifiers = Shift;
            map[Shift] = Level2;
        };
    };

    xkb_compat { };

    xkb_symbols {
        key <shift> {
            [ Shift_L ],
            [ SetMods(mods = X) ]
        };
        key <a> {
            type = "X",
            [ a, A ]
        };
    };
};
"#;

fn main() {
    let ctx = Context::new(0);
    let keymap =
        Keymap::new_from_string(&ctx, KEYMAP.to_string(), KEYMAP_FORMAT_TEXT_V1, 0).unwrap();
    
    // compositor
    let mut server_state = State::new(&keymap);
    server_state.update_key(Keycode::new(50), KeyDirection::Down);
    dbg!(server_state.serialize_mods(STATE_MODS_EFFECTIVE));
    dbg!(server_state.key_get_one_sym(Keycode::new(38)));
    
    // client
    let mut client_state = State::new(&keymap);
    client_state.update_mask(
        server_state.serialize_mods(STATE_MODS_DEPRESSED),
        server_state.serialize_mods(STATE_MODS_LATCHED),
        server_state.serialize_mods(STATE_MODS_LOCKED),
        0,
        0,
        server_state.serialize_layout(STATE_LAYOUT_EFFECTIVE),
    );
    dbg!(client_state.serialize_mods(STATE_MODS_EFFECTIVE));
    dbg!(client_state.key_get_one_sym(Keycode::new(38)));
}

The client should get the same keysym, but it does not. The output is

[src/main.rs:46:5] server_state.serialize_mods(STATE_MODS_EFFECTIVE) = 512
[src/main.rs:47:5] server_state.key_get_one_sym(Keycode::new(38)) = XK_a
[src/main.rs:58:5] client_state.serialize_mods(STATE_MODS_EFFECTIVE) = 513
[src/main.rs:59:5] client_state.key_get_one_sym(Keycode::new(38)) = XK_A

[mahkoh]

Seems to be fixed in master.