Fix issues with Sprite animation frame updates (#6493)

GDJS/Runtime/SpriteAnimator.ts

@@ -347,6 +347,7 @@ namespace gdjs {
 
       // Make sure to delete already existing animations which are not used anymore.
       this._animationFrame = null;
+      this.invalidateFrame();
     }
 
     updateFromObjectData(
@@ -476,16 +477,17 @@ namespace gdjs {
       return this._animations[this._currentAnimation].name;
     }
 
-    setAnimationName(newAnimationName: string): void {
+    setAnimationName(newAnimationName: string): boolean {
       if (!newAnimationName) {
-        return;
+        return false;
       }
       for (let i = 0; i < this._animations.length; ++i) {
         if (this._animations[i].name === newAnimationName) {
           this.setAnimationIndex(i);
-          return;
+          return true;
         }
       }
+      return false;
     }
 
     hasAnimationEnded(): boolean {

GDJS/Runtime/spriteruntimeobject.ts

@@ -237,7 +237,15 @@ namespace gdjs {
     }
 
     setAnimationName(newAnimationName: string): void {
-      this._animator.setAnimationName(newAnimationName);
+      const hasAnimationChanged = this._animator.setAnimationName(
+        newAnimationName
+      );
+      if (hasAnimationChanged) {
+        //TODO: This may be unnecessary.
+        this._renderer.update();
+        this._animationFrameDirty = true;
+        this.invalidateHitboxes();
+      }
     }
 
     /**