MultiResolutionImageSupport: fixed memory leak in `create(int,Dimensi…

…on[],Function<Dimension,Image>)` (issue #726)

CHANGELOG.md

@@ -5,6 +5,13 @@ FlatLaf Change Log
 
 #### Fixed bugs
 
+- Fixed memory leak in
+  `MultiResolutionImageSupport.create(int,Dimension[],Function<Dimension,Image>)`,
+  which caches images created by the producer function. Used by
+  `FlatSVGIcon.getImage()` and `FlatSVGUtils.createWindowIconImages()`. If you
+  use one of these methods, it is **strongly recommended** to upgrade to this
+  version, because if the returned image is larger and painted very often it may
+  result in an out-of-memory situation. (issue #726)
 - FileChooser: Fixed occasional NPE in `FlatShortcutsPanel` on Windows. (issue
   #718)
 - TextField: Fixed placeholder text painting, which did not respect horizontal

flatlaf-core/src/main/java9/com/formdev/flatlaf/util/MultiResolutionImageSupport.java

@@ -23,6 +23,7 @@
 import java.awt.image.MultiResolutionImage;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.IdentityHashMap;
 import java.util.List;
 import java.util.function.Function;
@@ -134,7 +135,7 @@ private static class ProducerMultiResolutionImage
 	{
 		private final Dimension[] dimensions;
 		private final Function<Dimension, Image> producer;
-		private final IdentityHashMap<Dimension, Image> cache = new IdentityHashMap<>();
+		private final HashMap<Dimension, Image> cache = new HashMap<>();
 
 		ProducerMultiResolutionImage( Dimension[] dimensions, Function<Dimension, Image> producer ) {
 			this.dimensions = dimensions;