Ensure ghost nodes are skipped when getting parent clipping rect (#16058)

# Objective

- Follow up on #16044
- `extract_uinode_borders` uses `bevy_hierarchy` directly instead of
going through the traversal utilities, meaning it won't handle
`GhostNode`s properly.

## Solution

- Replaced the use of `bevy_hierarchy::Parent` with
`UIChildren::get_parent`

## Testing

- Ran the `overflow` example, clipping looks ok.

---

---------

Co-authored-by: Carter Anderson <mcanders1@gmail.com>

crates/bevy_ui/src/render/mod.rs

@@ -5,8 +5,9 @@ mod ui_material_pipeline;
 pub mod ui_texture_slice_pipeline;
 
 use crate::{
-    BackgroundColor, BorderColor, CalculatedClip, ComputedNode, DefaultUiCamera, Display, Node,
-    Outline, ResolvedBorderRadius, TargetCamera, UiAntiAlias, UiBoxShadowSamples, UiImage, UiScale,
+    experimental::UiChildren, BackgroundColor, BorderColor, CalculatedClip, ComputedNode,
+    DefaultUiCamera, Outline, ResolvedBorderRadius, TargetCamera, UiAntiAlias, UiBoxShadowSamples,
+    UiImage, UiScale,
 };
 use bevy_app::prelude::*;
 use bevy_asset::{load_internal_asset, AssetEvent, AssetId, Assets, Handle};
@@ -16,7 +17,6 @@ use bevy_core_pipeline::core_3d::graph::{Core3d, Node3d};
 use bevy_core_pipeline::{core_2d::Camera2d, core_3d::Camera3d};
 use bevy_ecs::entity::{EntityHashMap, EntityHashSet};
 use bevy_ecs::prelude::*;
-use bevy_hierarchy::Parent;
 use bevy_math::{FloatOrd, Mat4, Rect, URect, UVec4, Vec2, Vec3, Vec3Swizzles, Vec4Swizzles};
 use bevy_render::render_phase::ViewSortedRenderPhases;
 use bevy_render::sync_world::MainEntity;
@@ -42,6 +42,7 @@ use bevy_render::{
 use bevy_sprite::TextureAtlasLayout;
 use bevy_sprite::{BorderRect, ImageScaleMode, SpriteAssetEvents, TextureAtlas};
 
+use crate::{Display, Node};
 use bevy_text::{ComputedTextBlock, PositionedGlyph, TextColor, TextLayoutInfo};
 use bevy_transform::components::GlobalTransform;
 use bevy_utils::HashMap;
@@ -406,11 +407,11 @@ pub fn extract_uinode_borders(
             Option<&CalculatedClip>,
             Option<&TargetCamera>,
             AnyOf<(&BorderColor, &Outline)>,
-            Option<&Parent>,
         )>,
     >,
     parent_clip_query: Extract<Query<&CalculatedClip>>,
     mapping: Extract<Query<RenderEntity>>,
+    ui_children: UiChildren,
 ) {
     let image = AssetId::<Image>::default();
 
@@ -423,7 +424,6 @@ pub fn extract_uinode_borders(
         maybe_clip,
         maybe_camera,
         (maybe_border_color, maybe_outline),
-        maybe_parent,
     ) in &uinode_query
     {
         let Some(camera_entity) = maybe_camera
@@ -480,8 +480,9 @@ pub fn extract_uinode_borders(
         if let Some(outline) = maybe_outline.filter(|outline| !outline.color.is_fully_transparent())
         {
             let outline_size = computed_node.outlined_node_size();
-            let parent_clip =
-                maybe_parent.and_then(|parent| parent_clip_query.get(parent.get()).ok());
+            let parent_clip = ui_children
+                .get_parent(entity)
+                .and_then(|parent| parent_clip_query.get(parent).ok());
 
             extracted_uinodes.uinodes.insert(
                 commands.spawn(TemporaryRenderEntity).id(),