Button: enabled Button.defaultButtonFollowsFocus on Windows, which allows pressing focused button with <kbd>Enter</kbd> key (as in Windows LaF)

CHANGELOG.md

@@ -12,6 +12,8 @@ FlatLaf Change Log
 - TabbedPane: Support background color for selected tabs.
 - CheckBox: changed `CheckBox.arc` from radius to diameter to be consistent with
   `Button.arc` and `Component.arc`
+- Button: Enabled `Button.defaultButtonFollowsFocus` on Windows, which allows
+  pressing focused button with <kbd>Enter</kbd> key (as in Windows LaF).
 - Fixed clipped borders at 125%, 150% and 175% scaling when outer focus width is
   zero (default in "Flat Light" and "Flat Dark" themes).
 

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -94,6 +94,7 @@ Button.margin=2,14,2,14
 Button.iconTextGap=4
 Button.rollover=true
 Button.defaultButtonFollowsFocus=false
+[win]Button.defaultButtonFollowsFocus=true
 
 Button.default.borderWidth=1
 

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

@@ -77,6 +77,9 @@ class ControlBar
 				EventQueue.invokeLater( () -> {
 					// update info label because user scale factor may change
 					updateInfoLabel();
+
+					// this is necessary because embedded JOptionPane's "steal" the default button
+					frame.getRootPane().setDefaultButton( closeButton );
 				} );
 			}
 		} );

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatTestFrame.java

@@ -143,6 +143,9 @@ public class FlatTestFrame
 			KeyStroke.getKeyStroke( KeyEvent.VK_ESCAPE, 0, false ),
 			JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT );
 
+		// make the "close" button the default button
+		getRootPane().setDefaultButton( closeButton );
+
 		// close frame
 		closeButton.addActionListener(e -> dispose());
 
@@ -170,6 +173,9 @@ public class FlatTestFrame
 
 					// enable/disable scale factor combobox
 					updateScaleFactorComboBox();
+
+					// this is necessary because embedded JOptionPane's "steal" the default button
+					getRootPane().setDefaultButton( closeButton );
 				} );
 			}
 		} );