Stopped increasing the cache size to accomodate large images. (#47387)

packages/flutter/lib/src/painting/image_cache.dart

@@ -207,20 +207,16 @@ class ImageCache {
       // Images that fail to load don't contribute to cache size.
       final int imageSize = info?.image == null ? 0 : info.image.height * info.image.width * 4;
       final _CachedImage image = _CachedImage(result, imageSize);
-      // If the image is bigger than the maximum cache size, and the cache size
-      // is not zero, then increase the cache size to the size of the image plus
-      // some change.
-      if (maximumSizeBytes > 0 && imageSize > maximumSizeBytes) {
-        _maximumSizeBytes = imageSize + 1000;
-      }
-      _currentSizeBytes += imageSize;
       final _PendingImage pendingImage = _pendingImages.remove(key);
       if (pendingImage != null) {
         pendingImage.removeListener();
       }
 
-      _cache[key] = image;
-      _checkCacheSize();
+      if (imageSize <= maximumSizeBytes) {
+        _currentSizeBytes += imageSize;
+        _cache[key] = image;
+        _checkCacheSize();
+      }
     }
     if (maximumSize > 0 && maximumSizeBytes > 0) {
       final ImageStreamListener streamListener = ImageStreamListener(listener);

packages/flutter/test/painting/image_cache_test.dart

@@ -121,14 +121,14 @@ void main() {
       expect(imageCache.currentSizeBytes, 256);
     });
 
-    test('Increases cache size if an image is loaded that is larger then the maximum size', () async {
+    test('Do not cache large images', () async {
       const TestImage testImage = TestImage(width: 8, height: 8);
 
       imageCache.maximumSizeBytes = 1;
       await extractOneFrame(const TestImageProvider(1, 1, image: testImage).resolve(ImageConfiguration.empty));
-      expect(imageCache.currentSize, 1);
-      expect(imageCache.currentSizeBytes, 256);
-      expect(imageCache.maximumSizeBytes, 256 + 1000);
+      expect(imageCache.currentSize, 0);
+      expect(imageCache.currentSizeBytes, 0);
+      expect(imageCache.maximumSizeBytes, 1);
     });
 
     test('Returns null if an error is caught resolving an image', () {