Update the UI texture slice pipeline to work with the retained render…

… world changes (#15578)

# Objective

Update the UI's texture slice extraction to work with the changes from
the retained render world PR (#15320).

crates/bevy_ui/src/render/ui_texture_slice_pipeline.rs

@@ -18,6 +18,7 @@ use bevy_render::{
  renderer::{RenderDevice, RenderQueue},
  texture::{BevyDefault, GpuImage, Image, TRANSPARENT_IMAGE_HANDLE},
  view::*,
+ world_sync::{RenderEntity, TemporaryRenderEntity},
  Extract, ExtractSchedule, Render, RenderSet,
 };
 use bevy_sprite::{
@@ -258,6 +259,7 @@ pub fn extract_ui_texture_slices(
  Option<&TextureAtlas>,
  )>,
  >,
+ mapping: Extract<Query<&RenderEntity>>,
 ) {
  for (uinode, transform, view_visibility, clip, camera, image, image_scale_mode, atlas) in
  &slicers_query
@@ -267,6 +269,10 @@ pub fn extract_ui_texture_slices(
  continue;
  };
 
+ let Ok(&camera_entity) = mapping.get(camera_entity) else {
+ continue;
+ };
+
  // Skip invisible images
  if !view_visibility.get()
  || image.color.is_fully_transparent()
@@ -291,7 +297,7 @@ pub fn extract_ui_texture_slices(
  };
 
  extracted_ui_slicers.slices.insert(
- commands.spawn_empty().id(),
+ commands.spawn(TemporaryRenderEntity).id(),
  ExtractedUiTextureSlice {
  stack_index: uinode.stack_index,
  transform: transform.compute_matrix(),
@@ -302,7 +308,7 @@ pub fn extract_ui_texture_slices(
  },
  clip: clip.map(|clip| clip.clip),
  image: image.texture.id(),
- camera_entity,
+ camera_entity: camera_entity.id(),
  image_scale_mode: image_scale_mode.clone(),
  atlas_rect,
  flip_x: image.flip_x,