Add play_unless_already_playing method to AnimationPlayer

crates/bevy_animation/src/lib.rs

@@ -123,6 +123,17 @@ impl AnimationPlayer {
         self
     }
 
+    /// Like `play`, but does nothing if the requested animation is already playing.
+    pub fn play_unless_already_playing(&mut self, handle: Handle<AnimationClip>) -> &mut Self {
+        if self.animation_clip != handle || self.is_paused() {
+            *self = Self {
+                animation_clip: handle,
+                ..Default::default()
+            };
+        }
+        self
+    }
+
     /// Set the animation to repeat
     pub fn repeat(&mut self) -> &mut Self {
         self.repeat = true;