fix: Ensure UpdateTransform is called at most once per frame

Assets/Cryville.EEW.Unity/Map/CameraController.cs

@@ -26,7 +26,7 @@ namespace Cryville.EEW.Unity.Map {
 			_tiles.CacheDir = Application.temporaryCachePath;
 			_camera.orthographicSize = 0.5f / MathF.Max(1, (float)_camera.pixelWidth / _camera.pixelHeight);
 			_elementLayerZ = m_layerElement.transform.position.z;
-			UpdateTransform();
+			_mapElementUpdated = true;
 		}
 		void OnDestroy() {
 			_tiles.Dispose();
@@ -39,7 +39,9 @@ namespace Cryville.EEW.Unity.Map {
 
 		static readonly Rect _viewportRect = new(0, 0, 1, 1);
 		Vector3? ppos;
+		bool _mapElementUpdated;
 		void Update() {
+			bool flag = false;
 			var cpos = Input.mousePosition;
 			bool isMouseInViewport = _viewportRect.Contains(_camera.ScreenToViewportPoint(Input.mousePosition));
 			if (Input.GetMouseButtonDown(0) && isMouseInViewport) {
@@ -49,18 +51,25 @@ namespace Cryville.EEW.Unity.Map {
 				var delta = _camera.ScreenToWorldPoint(pos0) - _camera.ScreenToWorldPoint(cpos);
 				transform.position += delta;
 				ppos = cpos;
-				UpdateTransform();
+				flag = true;
 			}
 			if (Input.GetMouseButtonUp(0)) {
 				ppos = null;
 			}
 			if (Input.mouseScrollDelta.y != 0 && isMouseInViewport) {
 				Scale *= Mathf.Pow(2, -Input.mouseScrollDelta.y / 8);
-				UpdateTransform();
+				flag = true;
+			}
+			if (_mapElementUpdated) {
+				_mapElementUpdated = false;
+				ZoomToMapElement();
+				flag = true;
+			}
+			if (flag) {
+				UpdateTransform(); // Ensure UpdateTransform is called at most once per frame for tiles to unload correctly
 			}
 		}
-
-		public void OnMapElementUpdated() {
+		void ZoomToMapElement() {
 			var aabb = m_layerElement.AABB;
 			if (aabb is not RectangleF b) return;
 			if (b.Width * _camera.pixelHeight < _camera.pixelWidth * b.Height)
@@ -70,7 +79,9 @@ namespace Cryville.EEW.Unity.Map {
 			Scale *= 0.6f;
 			if (Scale < 0.01f) Scale = 0.01f;
 			transform.localPosition = new PointF(b.X + b.Width / 2, b.Y + b.Height / 2).ToVector2();
-			UpdateTransform();
+		}
+		public void OnMapElementUpdated() {
+			_mapElementUpdated = true;
 		}
 
 		void UpdateTransform() {

Assets/Cryville.EEW.Unity/Map/CameraController.cs.meta

@@ -4,7 +4,7 @@ MonoImporter:
   externalObjects: {}
   serializedVersion: 2
   defaultReferences: []
-  executionOrder: 0
+  executionOrder: 5
   icon: {instanceID: 0}
   userData: 
   assetBundleName: