code style

Runtime/painting/image_cache.cs

             this._cache.Clear();
             this._pendingImages.Clear();
             this._currentSizeBytes = 0;
-            
+
             this._lruKeys.Clear();
         }
 
                 this._lruKeys.Remove(image.node);
                 return true;
             }
+
-        public ImageStreamCompleter putIfAbsent(object key, Func<ImageStreamCompleter> loader, ImageErrorListener onError = null) {
+        public ImageStreamCompleter putIfAbsent(object key, Func<ImageStreamCompleter> loader,
+            ImageErrorListener onError = null) {
             D.assert(key != null);
             D.assert(loader != null);
 
             void listener(ImageInfo info, bool syncCall) {
                 int imageSize = info?.image == null ? 0 : info.image.height * info.image.width * 4;
                 _CachedImage cachedImage = new _CachedImage(result, imageSize);
-                
+
-                
+
                 this._currentSizeBytes += imageSize;
 
                 if (this._pendingImages.TryGetValue(key, out var loadedPendingImage)) {
-                
+
                 D.assert(!this._cache.ContainsKey(key));
                 this._cache[key] = cachedImage;
                 cachedImage.node = this._lruKeys.AddLast(key);
             this.completer = completer;
             this.sizeBytes = sizeBytes;
         }
-        
+
         public ImageStreamCompleter completer;
         public int sizeBytes;
         public LinkedListNode<object> node;