Invert the dependency between bevy_animation and bevy_ui (#15634)

# Objective

- Improve crate dependency graph

## Solution

- Invert a dependency

## Testing

- Tested ui and animation examples

crates/bevy_animation/Cargo.toml

@@ -27,9 +27,6 @@ bevy_utils = { path = "../bevy_utils", version = "0.15.0-dev" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.15.0-dev" }
 bevy_transform = { path = "../bevy_transform", version = "0.15.0-dev" }
 bevy_hierarchy = { path = "../bevy_hierarchy", version = "0.15.0-dev" }
-bevy_ui = { path = "../bevy_ui", version = "0.15.0-dev", features = [
-  "bevy_text",
-] }
 bevy_text = { path = "../bevy_text", version = "0.15.0-dev" }
 
 # other

crates/bevy_animation/src/lib.rs

@@ -44,7 +44,6 @@ use bevy_reflect::{
 };
 use bevy_time::Time;
 use bevy_transform::{prelude::Transform, TransformSystem};
-use bevy_ui::UiSystem;
 use bevy_utils::{
     hashbrown::HashMap,
     tracing::{trace, warn},
@@ -1043,6 +1042,10 @@ pub fn animate_targets(
         });
 }
 
+/// Animation system set
+#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
+pub struct Animation;
+
 /// Adds animation support to an app
 #[derive(Default)]
 pub struct AnimationPlugin;
@@ -1078,8 +1081,8 @@ impl Plugin for AnimationPlugin {
                     expire_completed_transitions,
                 )
                     .chain()
-                    .before(TransformSystem::TransformPropagate)
-                    .before(UiSystem::Prepare),
+                    .in_set(Animation)
+                    .before(TransformSystem::TransformPropagate),
             );
     }
 }

crates/bevy_ui/Cargo.toml

@@ -24,6 +24,7 @@ bevy_reflect = { path = "../bevy_reflect", version = "0.15.0-dev", features = [
   "bevy",
 ] }
 bevy_render = { path = "../bevy_render", version = "0.15.0-dev" }
+bevy_animation = { path = "../bevy_animation", version = "0.15.0-dev" }
 bevy_sprite = { path = "../bevy_sprite", version = "0.15.0-dev" }
 bevy_text = { path = "../bevy_text", version = "0.15.0-dev", optional = true }
 bevy_picking = { path = "../bevy_picking", version = "0.15.0-dev", optional = true }

crates/bevy_ui/src/lib.rs

@@ -152,7 +152,9 @@ impl Plugin for UiPlugin {
                 PostUpdate,
                 (
                     CameraUpdateSystem,
-                    UiSystem::Prepare.before(UiSystem::Stack),
+                    UiSystem::Prepare
+                        .before(UiSystem::Stack)
+                        .after(bevy_animation::Animation),
                     UiSystem::Layout,
                     UiSystem::PostLayout,
                 )