macOS: hide popups when window is resized (issue #1082)

Author: DevCharly

CHANGELOG.md

@@ -12,6 +12,8 @@ FlatLaf Change Log
 - Slider: Styling `thumbSize` or `focusWidth` did not update slider size/layout.
   (PR #1074)
 - ToolBar: Grip disappeared when switching between Look and Feels. (issue #1075)
+- macOS: Popups (menus and combobox lists) were not always hidden when window is
+  resized. (issue #1082)
 - Extras:
   - UI defaults inspector: Fixed NPE if color of `FlatLineBorder` is null. Also
     use `FlatLineBorder` line color as cell background color in "Value" column.

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLaf.java

@@ -310,8 +310,8 @@ public void initialize() {
 		// install submenu usability helper
 		subMenuUsabilityHelperInstalled = SubMenuUsabilityHelper.install();
 
-		// install Linux popup menu canceler
-		if( SystemInfo.isLinux )
+		// install Linux/macOS popup menu canceler
+		if( SystemInfo.isLinux || SystemInfo.isMacOS )
 			linuxPopupMenuCanceler = new LinuxPopupMenuCanceler();
 
 		// listen to desktop property changes to update UI if system font or scaling changes

flatlaf-core/src/main/java/com/formdev/flatlaf/LinuxPopupMenuCanceler.java

@@ -30,7 +30,7 @@
 import javax.swing.event.ChangeListener;
 
 /**
- * Cancels (hides) popup menus on Linux.
+ * Cancels (hides) popup menus on Linux and macOS.
  * <p>
  * On Linux, popups are not hidden under following conditions, which results in
  * misplaced popups:
@@ -41,7 +41,13 @@
  *   <li>window deactivated (e.g. activated other application)
  * </ul>
  *
- * On Windows and macOS, popups are automatically hidden.
+ * On macOS, popups are usually automatically hidden, but not always.
+ * When resizing a window, then it depends where clicking to start resizing (and on the Java version).
+ * E.g. with Java 25, clicking at bottom-right corner inside of the window does not hide the popups.
+ * But clicking on same corner outside of the window, hides the popup.
+ *
+ * <p>
+ * On Windows, popups are automatically hidden.
  * <p>
  * The implementation is similar to what's done in
  * {@code javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber},