UI defaults inspector:

- add placeholder text to filter field
- fixed menu item text in Demo

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

@@ -600,7 +600,7 @@ class DemoFrame
 				optionsMenu.add(showHintsMenuItem);
 
 				//---- showUIDefaultsInspectorMenuItem ----
-				showUIDefaultsInspectorMenuItem.setText("Show UIDefaults Inspector");
+				showUIDefaultsInspectorMenuItem.setText("Show UI Defaults Inspector");
 				showUIDefaultsInspectorMenuItem.addActionListener(e -> showUIDefaultsInspector());
 				optionsMenu.add(showUIDefaultsInspectorMenuItem);
 			}

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

@@ -390,7 +390,7 @@ new FormModel {
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "showUIDefaultsInspectorMenuItem"
-						"text": "Show UIDefaults Inspector"
+						"text": "Show UI Defaults Inspector"
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "showUIDefaultsInspector", false ) )
 					} )
 				} )

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatUIDefaultsInspector.java

@@ -408,6 +408,9 @@ public class FlatUIDefaultsInspector
 					filterPanel.add(flterLabel, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0,
 						GridBagConstraints.CENTER, GridBagConstraints.BOTH,
 						new Insets(0, 0, 0, 10), 0, 0));
+
+					//---- filterField ----
+					filterField.putClientProperty("JTextField.placeholderText", "enter one or more filter strings, separated by space characters");
 					filterPanel.add(filterField, new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0,
 						GridBagConstraints.CENTER, GridBagConstraints.BOTH,
 						new Insets(0, 0, 0, 10), 0, 0));

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatUIDefaultsInspector.jfd

@@ -31,6 +31,7 @@ new FormModel {
 					}, new FormLayoutConstraints( class com.jformdesigner.runtime.GridBagConstraintsEx ) )
 					add( new FormComponent( "javax.swing.JTextField" ) {
 						name: "filterField"
+						"$client.JTextField.placeholderText": "enter one or more filter strings, separated by space characters"
 					}, new FormLayoutConstraints( class com.jformdesigner.runtime.GridBagConstraintsEx ) {
 						"gridx": 1
 					} )