Fix wireframe specialization

[blaind]

Objective

Fixes #25375

Solution

When msaa changes, bevy detects the view key as changed. Existing code sets only DirtySpecializations as dirty, but leaves DirtyWireframeSpecializations untouched. This patch adds the dirty flag to the latter as well.

Testing

To test the before-after behavior, please apply the patch at #25375 to the bevy wireframe example.

Before this patch: error logs + crash

After this patch: continues working

Tested both 3d & 2d.

2D repro

diff --git a/examples/2d/wireframe_2d.rs b/examples/2d/wireframe_2d.rs
index 9b3e16a39..6d5a3a9c6 100644
--- a/examples/2d/wireframe_2d.rs
+++ b/examples/2d/wireframe_2d.rs
@@ -55,6 +55,7 @@ fn main() {
         })
         .insert_resource(UiTheme(theme::basic_example_theme(Color::WHITE)))
         .add_systems(Startup, setup)
+        .add_systems(Update, toggle_msaa)
         .add_observer(update_radio_button)
         .add_observer(radio_self_update)
         .run();
@@ -164,7 +165,19 @@ fn setup(
         },
     ));

-    commands.spawn(Camera2d);
+    commands.spawn((Camera2d, Msaa::Sample4));
+}
+
+fn toggle_msaa(
+    keyboard_input: Res<ButtonInput<KeyCode>>,
+    mut camera_msaa: Single<&mut Msaa, With<Camera2d>>,
+) {
+    if keyboard_input.just_pressed(KeyCode::Space) {
+        **camera_msaa = match **camera_msaa {
+            Msaa::Off => Msaa::Sample4,
+            _ => Msaa::Off,
+        };
+    }
 }

 /// This system lets you toggle various wireframe settings

AI disclosure: the root cause analysis, patch & test code for 2D was written by AI.