On X11, use events modifiers to detect state

While there's a separate event to deliver modifiers for keyboard,
unfortunately, it's not even remotely reflects the modifiers state.

Thus use events along side regular modifier updates to correctly
detect the state. Also, apply the modifiers from the regular
key event by converting their state to xkb modifiers state.

Links: https://github.com/alacritty/alacritty/issues/7549
Closes: #3388

src/platform_impl/linux/x11/mod.rs

@@ -30,12 +30,13 @@ use x11rb::protocol::xproto::{self, ConnectionExt as _};
 use x11rb::x11_utils::X11Error as LogicalError;
 use x11rb::xcb_ffi::ReplyOrIdError;
 
-use super::{common::xkb_state::KbdState, ControlFlow, OsError};
+use super::{ControlFlow, OsError};
 use crate::{
     error::{EventLoopError, OsError as RootOsError},
     event::{Event, StartCause, WindowEvent},
     event_loop::{DeviceEvents, EventLoopClosed, EventLoopWindowTarget as RootELW},
     platform::pump_events::PumpStatus,
+    platform_impl::common::xkb::Context,
     platform_impl::{
         platform::{min_timeout, WindowId},
         PlatformSpecificWindowBuilderAttributes,
@@ -285,8 +286,8 @@ impl<T: 'static> EventLoop<T> {
         // Create a channel for sending user events.
         let (user_sender, user_channel) = mpsc::channel();
 
-        let kb_state =
-            KbdState::from_x11_xkb(xconn.xcb_connection().get_raw_xcb_connection()).unwrap();
+        let xkb_context =
+            Context::from_x11_xkb(xconn.xcb_connection().get_raw_xcb_connection()).unwrap();
 
         let window_target = EventLoopWindowTarget {
             ime,
@@ -327,7 +328,7 @@ impl<T: 'static> EventLoop<T> {
             ime_event_receiver,
             xi2ext,
             xkbext,
-            kb_state,
+            xkb_context,
             num_touch: 0,
             held_key_press: None,
             first_touch: None,