added system properties "flatlaf.animation" and "flatlaf.smoothScrolling" to disable all animations or smooth scrolling via command line (without modifying the application)

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.java

@@ -33,6 +33,7 @@ import com.formdev.flatlaf.FlatDarkLaf;
 import com.formdev.flatlaf.FlatIntelliJLaf;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatLightLaf;
+import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.demo.HintManager.Hint;
 import com.formdev.flatlaf.demo.extras.*;
 import com.formdev.flatlaf.demo.intellijthemes.*;
@@ -266,6 +267,14 @@ class DemoFrame
 		repaint();
 	}
 
+	private void animationChanged() {
+		boolean enabled = animationMenuItem.isSelected();
+		System.setProperty( FlatSystemProperties.ANIMATION, Boolean.toString( enabled ) );
+
+		smoothScrollingMenuItem.setEnabled( enabled );
+		animatedLafChangeMenuItem.setEnabled( enabled );
+	}
+
 	private void smoothScrollingChanged() {
 		UIManager.put( "ScrollPane.smoothScrolling", smoothScrollingMenuItem.isSelected() );
 	}
@@ -509,6 +518,7 @@ class DemoFrame
 		showTitleBarIconMenuItem = new JCheckBoxMenuItem();
 		underlineMenuSelectionMenuItem = new JCheckBoxMenuItem();
 		alwaysShowMnemonicsMenuItem = new JCheckBoxMenuItem();
+		animationMenuItem = new JCheckBoxMenuItem();
 		smoothScrollingMenuItem = new JCheckBoxMenuItem();
 		animatedLafChangeMenuItem = new JCheckBoxMenuItem();
 		JMenuItem showHintsMenuItem = new JMenuItem();
@@ -797,6 +807,13 @@ class DemoFrame
 				alwaysShowMnemonicsMenuItem.setText("Always show mnemonics");
 				alwaysShowMnemonicsMenuItem.addActionListener(e -> alwaysShowMnemonics());
 				optionsMenu.add(alwaysShowMnemonicsMenuItem);
+				optionsMenu.addSeparator();
+
+				//---- animationMenuItem ----
+				animationMenuItem.setText("Animation");
+				animationMenuItem.setSelected(true);
+				animationMenuItem.addActionListener(e -> animationChanged());
+				optionsMenu.add(animationMenuItem);
 
 				//---- smoothScrollingMenuItem ----
 				smoothScrollingMenuItem.setText("Smooth Scrolling");
@@ -992,6 +1009,7 @@ class DemoFrame
 	private JCheckBoxMenuItem showTitleBarIconMenuItem;
 	private JCheckBoxMenuItem underlineMenuSelectionMenuItem;
 	private JCheckBoxMenuItem alwaysShowMnemonicsMenuItem;
+	private JCheckBoxMenuItem animationMenuItem;
 	private JCheckBoxMenuItem smoothScrollingMenuItem;
 	private JCheckBoxMenuItem animatedLafChangeMenuItem;
 	private JMenuItem aboutMenuItem;

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.jfd

@@ -418,6 +418,18 @@ new FormModel {
 						}
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "alwaysShowMnemonics", false ) )
 					} )
+					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
+						name: "separator9"
+					} )
+					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
+						name: "animationMenuItem"
+						"text": "Animation"
+						"selected": true
+						auxiliary() {
+							"JavaCodeGenerator.variableLocal": false
+						}
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "animationChanged", false ) )
+					} )
 					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
 						name: "smoothScrollingMenuItem"
 						"text": "Smooth Scrolling"

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesPanel.java

@@ -25,6 +25,7 @@ import java.awt.Window;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.awt.event.WindowListener;
+import java.beans.Beans;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.io.File;
@@ -156,6 +157,9 @@ public class IJThemesPanel
 	}
 
 	private void updateThemesList() {
+		if( Beans.isDesignTime() )
+			return; // disable if running in GUI builder
+
 		int filterLightDark = filterComboBox.getSelectedIndex();
 		boolean showLight = (filterLightDark != 2);
 		boolean showDark = (filterLightDark != 1);