SplitPane: fixed StackOverflowError caused by layout loop that may occur under special circumstances (issue #513)

CHANGELOG.md

@@ -11,6 +11,8 @@ FlatLaf Change Log
   font. (issue #506)
 - FileChooser: Enabled full row selection for details view to fix alternate row
   coloring. (issue #512)
+- SplitPane: Fixed `StackOverflowError` caused by layout loop that may occur
+  under special circumstances. (issue #513)
 - ToolBar: Fixed endless loop in focus navigation that may occur under special
   circumstances. (issue #505)
 - IntelliJ Themes: `Component.accentColor` UI property now has useful theme

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSplitPaneUI.java

@@ -235,7 +235,7 @@ public class FlatSplitPaneUI
 			switch( e.getPropertyName() ) {
 				case JSplitPane.DIVIDER_LOCATION_PROPERTY:
 					// necessary to show/hide one-touch buttons on expand/collapse
-					revalidate();
+					doLayout();
 					break;
 			}
 		}