JideSplitButton: fixed updating popup when switching theme (issue #1000)

CHANGELOG.md

@@ -4,6 +4,7 @@ FlatLaf Change Log
 ## 3.7-SNAPSHOT
 
 - Extras: Support JSVG 2.0.0. Minimum JSVG version is now 1.6.0. (issue #997)
+- JideSplitButton: Fixed updating popup when switching theme. (issue #1000)
 
 
 ## 3.6

flatlaf-jide-oss/src/main/java/com/formdev/flatlaf/jideoss/ui/FlatJideSplitButtonUI.java

@@ -25,9 +25,11 @@ import java.awt.geom.Rectangle2D;
 import javax.swing.ButtonModel;
 import javax.swing.JComponent;
 import javax.swing.JMenuItem;
+import javax.swing.JPopupMenu;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.PopupMenuUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 import com.formdev.flatlaf.util.UIScale;
 import com.jidesoft.plaf.LookAndFeelFactory;
@@ -54,6 +56,14 @@ public class FlatJideSplitButtonUI
 		// but it does not because FlatLaf already has added the UI class to the UI defaults
 		LookAndFeelFactory.installJideExtension();
 
+		// workaround for bug in JideSplitButton, which overrides JMenu.updateUI(),
+		// but does not invoke super.updateUI() to update UI of JMenu.popupMenu field
+		if( c instanceof JideSplitButton ) {
+			JPopupMenu popupMenu = ((JideSplitButton)c).getPopupMenu();
+			if( popupMenu != null )
+				popupMenu.setUI( (PopupMenuUI) UIManager.getUI( popupMenu ) );
+		}
+
 		return new FlatJideSplitButtonUI();
 	}