gdk4-x11: Make assert_initialized_main_thread a no-op

GDK4 does not require initialization, and this was previously broken
since `INITIALIZED` and `IS_MAIN_THREAD` were never set.

Author: ids1024

gdk4-x11/src/rt.rs

@@ -1,43 +1,10 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
 
-use std::cell::Cell;
-use std::sync::atomic::{AtomicBool, Ordering};
-
-thread_local! {
-    static IS_MAIN_THREAD: Cell<bool> = Cell::new(false)
-}
-
-static INITIALIZED: AtomicBool = AtomicBool::new(false);
-
 macro_rules! assert_initialized_main_thread {
-    () => {
-        #[allow(unknown_lints)]
-        #[allow(clippy::if_then_panic)]
-        if !crate::rt::is_initialized_main_thread() {
-            if crate::rt::is_initialized() {
-                panic!("GDK may only be used from the main thread.");
-            } else {
-                panic!("GDK has not been initialized. Call `gtk::init` first.");
-            }
-        }
-    };
+    () => {};
 }
 
 /// No-op.
 macro_rules! skip_assert_initialized {
     () => {};
 }
-
-/// Returns `true` if GDK has been initialized.
-#[inline]
-pub fn is_initialized() -> bool {
-    skip_assert_initialized!();
-    INITIALIZED.load(Ordering::Acquire)
-}
-
-/// Returns `true` if GDK has been initialized and this is the main thread.
-#[inline]
-pub fn is_initialized_main_thread() -> bool {
-    skip_assert_initialized!();
-    IS_MAIN_THREAD.with(|c| c.get())
-}