gdk4-x11: Make X11Display::set_program_class take &self

Despite taking `GdkDisplay`, this function casts the argument to a
`GdkX11Display`.

Author: ids1024

gdk4-x11/Gir.toml

@@ -131,6 +131,9 @@ status = "generate"
     name = "text_property_to_text_list"
     # TODO: requires a manual implementation
     manual = true
+    [[object.function]]
+    name = "set_program_class"
+    manual = true
 
 [[object]]
 name = "GdkX11.X11Monitor"

gdk4-x11/src/auto/x11_display.rs

@@ -3,7 +3,6 @@
 // DO NOT EDIT
 
 use crate::X11Screen;
-use glib::object::IsA;
 use glib::translate::*;
 use std::fmt;
 use std::mem;
@@ -229,17 +228,6 @@ impl X11Display {
         assert_initialized_main_thread!();
         unsafe { from_glib_full(ffi::gdk_x11_display_open(display_name.to_glib_none().0)) }
     }
-
-    #[doc(alias = "gdk_x11_display_set_program_class")]
-    pub fn set_program_class(display: &impl IsA<gdk::Display>, program_class: &str) {
-        assert_initialized_main_thread!();
-        unsafe {
-            ffi::gdk_x11_display_set_program_class(
-                display.as_ref().to_glib_none().0,
-                program_class.to_glib_none().0,
-            );
-        }
-    }
 }
 
 impl fmt::Display for X11Display {

gdk4-x11/src/x11_display.rs

@@ -1,6 +1,7 @@
 // Take a look at the license at the top of the repository in the LICENSE file.
 
 use crate::X11Display;
+use glib::Cast;
 #[cfg(any(feature = "xlib", feature = "dox"))]
 #[cfg_attr(feature = "dox", doc(cfg(feature = "xlib")))]
 use glib::{signal::connect_raw, signal::SignalHandlerId, ObjectType};
@@ -95,4 +96,15 @@ impl X11Display {
             Box_::into_raw(f),
         )
     }
+
+    #[doc(alias = "gdk_x11_display_set_program_class")]
+    pub fn set_program_class(&self, program_class: &str) {
+        assert_initialized_main_thread!();
+        unsafe {
+            ffi::gdk_x11_display_set_program_class(
+                self.upcast_ref::<gdk::Display>().to_glib_none().0,
+                program_class.to_glib_none().0,
+            );
+        }
+    }
 }