Slight clarification in the ImageCache docs (#33195)
It was easy to miss the reference to the top-level `imageCache`
property before. This calls out the property a little more
explicitly.
diff --git a/packages/flutter/lib/src/painting/image_cache.dart b/packages/flutter/lib/src/painting/image_cache.dart
index 0a0b1a7..66f4033 100644
--- a/packages/flutter/lib/src/painting/image_cache.dart
+++ b/packages/flutter/lib/src/painting/image_cache.dart
@@ -7,7 +7,7 @@
const int _kDefaultSize = 1000;
const int _kDefaultSizeBytes = 100 << 20; // 100 MiB
-/// Class for the [imageCache] object.
+/// Class for caching images.
///
/// Implements a least-recently-used cache of up to 1000 images, and up to 100
/// MB. The maximum size can be adjusted using [maximumSize] and
@@ -25,6 +25,9 @@
///
/// Generally this class is not used directly. The [ImageProvider] class and its
/// subclasses automatically handle the caching of images.
+///
+/// A shared instance of this cache is retained by [PaintingBinding] and can be
+/// obtained via the [imageCache] top-level property in the [painting] library.
class ImageCache {
final Map<Object, _PendingImage> _pendingImages = <Object, _PendingImage>{};
final Map<Object, _CachedImage> _cache = <Object, _CachedImage>{};
