render: Use NamespaceElements to fix blurred lower layer-shell surfaces

src/shell/mod.rs

@@ -5038,13 +5038,14 @@ impl Shell {
 
         let map = smithay::desktop::layer_map_for_output(output);
         for layer_surface in map.layers() {
+            let namespace = self.workspaces.active_num(output).1;
             layer_surface.take_presentation_feedback(
                 &mut output_presentation_feedback,
                 surface_primary_scanout_output,
                 |surface, _| {
                     surface_presentation_feedback_flags_from_states(
                         surface,
-                        None,
+                        Some(namespace),
                         render_element_states,
                     )
                 },