Backport official GLib iterator safety fix for Linux desktop

apps/desktop/src-tauri/vendor/glib/tests/print.rs

@@ -0,0 +1,49 @@
+use std::sync::{Arc, Mutex};
+
+use glib::*;
+
+// Funny thing: we can't put those two tests in two different functions, otherwise they might
+// conflict with the results of the other one (or it would be mandatory to run the tests on only
+// one thread).
+#[test]
+fn check_print_handler() {
+    //
+    // g_print check part
+    //
+    let count = Arc::new(Mutex::new(0));
+    set_print_handler(clone!(@weak count => move |_| {
+        // we don't care about the message in here!
+        *count.lock().expect("failed to lock 1") += 1;
+    }));
+    g_print!("test");
+    assert_eq!(*count.lock().expect("failed to lock 2"), 1);
+    g_printerr!("one");
+    assert_eq!(*count.lock().expect("failed to lock 3"), 1);
+    g_print!("another");
+    assert_eq!(*count.lock().expect("failed to lock 4"), 2);
+    unset_print_handler();
+    g_print!("tadam");
+    assert_eq!(*count.lock().expect("failed to lock 5"), 2);
+    g_printerr!("toudoum");
+    assert_eq!(*count.lock().expect("failed to lock 6"), 2);
+
+    //
+    // g_printerr check part
+    //
+    let count = Arc::new(Mutex::new(0));
+    set_printerr_handler(clone!(@weak count => move |_| {
+        // we don't care about the message in here!
+        *count.lock().expect("failed to lock a") += 1;
+    }));
+    g_printerr!("test");
+    assert_eq!(*count.lock().expect("failed to lock b"), 1);
+    g_print!("one");
+    assert_eq!(*count.lock().expect("failed to lock c"), 1);
+    g_printerr!("another");
+    assert_eq!(*count.lock().expect("failed to lock d"), 2);
+    unset_printerr_handler();
+    g_printerr!("tadam");
+    assert_eq!(*count.lock().expect("failed to lock e"), 2);
+    g_print!("toudoum");
+    assert_eq!(*count.lock().expect("failed to lock f"), 2);
+}