Use popup_output() in commit handler

Fixes layer shell popups not causing redraws.

src/handlers/compositor.rs

@@ -1,7 +1,6 @@
 use std::collections::hash_map::Entry;
 
 use smithay::backend::renderer::utils::{on_commit_buffer_handler, with_renderer_surface_state};
-use smithay::desktop::find_popup_root_surface;
 use smithay::input::pointer::CursorImageStatus;
 use smithay::reexports::calloop::Interest;
 use smithay::reexports::wayland_server::protocol::wl_buffer;
@@ -150,11 +149,8 @@ impl CompositorHandler for State {
         // This might be a popup.
         self.popups_handle_commit(surface);
         if let Some(popup) = self.niri.popups.find_popup(surface) {
-            if let Ok(root) = find_popup_root_surface(&popup) {
-                let root_window_output = self.niri.layout.find_window_and_output(&root);
-                if let Some((_window, output)) = root_window_output {
-                    self.niri.queue_redraw(output);
-                }
+            if let Some(output) = self.popup_output(&popup) {
+                self.niri.queue_redraw(output);
             }
         }