gdk: Mark region as non-mutable

Author: bilelmoussaoui

gdk4/Gir.toml

@@ -28,7 +28,6 @@ generate = [
     "Gdk.DmabufError",
     "Gdk.DmabufFormats",
     "Gdk.DmabufTexture",
-    "Gdk.DmabufTextureBuilder",
     "Gdk.DNDEvent",
     "Gdk.DragAction",
     "Gdk.DragCancelReason",
@@ -423,6 +422,15 @@ name = "Gdk.DisplayManager"
 status = "generate"
 generate_builder = false
 
+[[object]]
+name = "Gdk.DmabufTextureBuilder"
+status = "generate"
+    [[object.function]]
+    name = "set_update_region"
+        [[object.function.parameter]]
+        name = "region"
+        const = true
+
 [[object]]
 name = "Gdk.Drag"
 status = "generate"

gdk4/src/auto/dmabuf_texture_builder.rs

@@ -189,11 +189,11 @@ impl DmabufTextureBuilder {
     }
 
     #[doc(alias = "gdk_dmabuf_texture_builder_set_update_region")]
-    pub fn set_update_region(&self, region: Option<&mut cairo::Region>) {
+    pub fn set_update_region(&self, region: Option<&cairo::Region>) {
         unsafe {
             ffi::gdk_dmabuf_texture_builder_set_update_region(
                 self.to_glib_none().0,
-                region.to_glib_none_mut().0,
+                mut_override(region.to_glib_none().0),
             );
         }
     }