On macOS, move automatic tabbing setting to ELWT

Those are global for the application, so it's better to keep them
on EventLoopWindowTarget.

src/platform_impl/macos/event_loop.rs

@@ -21,7 +21,7 @@ use objc2::rc::{autoreleasepool, Id, Shared};
 use objc2::{msg_send_id, ClassType};
 use raw_window_handle::{AppKitDisplayHandle, RawDisplayHandle};
 
-use super::appkit::{NSApp, NSApplicationActivationPolicy, NSEvent};
+use super::appkit::{NSApp, NSApplicationActivationPolicy, NSEvent, NSWindow};
 use crate::{
     event::Event,
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootWindowTarget},
@@ -101,6 +101,14 @@ impl<T> EventLoopWindowTarget<T> {
     pub(crate) fn hide_other_applications(&self) {
         NSApp().hideOtherApplications(None)
     }
+
+    pub(crate) fn set_allows_automatic_window_tabbing(&self, enabled: bool) {
+        NSWindow::setAllowsAutomaticWindowTabbing(enabled)
+    }
+
+    pub(crate) fn allows_automatic_window_tabbing(&self) -> bool {
+        NSWindow::allowsAutomaticWindowTabbing()
+    }
 }
 
 pub struct EventLoop<T: 'static> {