Windows: Add missing arc property for lists on Windows 11

core/src/main/java/com/github/weisj/darklaf/ui/tree/DarkTreeUI.java

@@ -156,7 +156,8 @@ public class DarkTreeUI extends BasicTreeUI implements PropertyChangeListener, C
         arc = UIManager.getInt("Tree.selection.arc");
         selectionMargin = UIManager.getInsets("Tree.selection.margin");
         if (selectionMargin != null) {
-            PropertyUtil.installBorder(tree, new BorderUIResource.EmptyBorderUIResource(selectionMargin));
+            PropertyUtil.installBorder(tree,
+                    new BorderUIResource.EmptyBorderUIResource(DarkUIUtil.scale(selectionMargin, 0.5f, null)));
         }
     }
 

core/src/main/java/com/github/weisj/darklaf/ui/util/DarkUIUtil.java

@@ -98,13 +98,18 @@ public final class DarkUIUtil {
         return scale(ins, -1);
     }
 
-    public static Insets scale(final Insets ins, final int factor) {
+    public static Insets scale(final Insets ins, final float factor) {
+        return scale(ins, factor, ins);
+    }
+
+    public static Insets scale(final Insets ins, final float factor, final Insets out) {
         if (ins == null) return null;
-        ins.left *= factor;
-        ins.right *= factor;
-        ins.top *= factor;
-        ins.bottom *= factor;
-        return ins;
+        Insets result = out != null ? out : new Insets(0, 0, 0, 0);
+        result.left = (int) (ins.left * factor);
+        result.right = (int) (ins.right * factor);
+        result.top = (int) (ins.top * factor);
+        result.bottom = (int) (ins.bottom * factor);
+        return result;
     }
 
     public static Insets addInsets(final Insets ins1, final Insets ins2) {