Menu: Allow specifying non rounded corners on menubars

core/src/main/java/com/github/weisj/darklaf/ui/menu/DarkMenuUI.java

@@ -40,6 +40,7 @@ public class DarkMenuUI extends BasicMenuUI implements MenuItemUI {
     protected Icon arrowIconDisabled;
     protected JMenu menu;
     private int arc;
+    private int topLevelArc;
 
     public static ComponentUI createUI(final JComponent x) {
         return new DarkMenuUI();
@@ -121,6 +122,7 @@ public class DarkMenuUI extends BasicMenuUI implements MenuItemUI {
                 PropertyUtil.parseBooleanProperty(UIManager.get(getPropertyPrefix() + ".evenHeight"), true);
         acceleratorTextOffset = UIManager.getInt(getPropertyPrefix() + ".acceleratorTextOffset");
         arc = UIManager.getInt("MenuItem.arc");
+        topLevelArc = UIManager.getInt("MenuBar.arc");
     }
 
     @Override
@@ -191,6 +193,9 @@ public class DarkMenuUI extends BasicMenuUI implements MenuItemUI {
 
     @Override
     public int getArc() {
+        if (menu.isTopLevelMenu()) {
+            return topLevelArc;
+        }
         return arc;
     }
 

core/src/main/resources/com/github/weisj/darklaf/nativelaf/windows11.properties

@@ -40,9 +40,11 @@ PopupMenuDivider.size                       = 9,9
 MenuItem.insets                             = 1,7,1,7
 MenuItem.arc                                = %arc
 
-MenuBar.border.margins                      = 5,0,5,0
 Menu.rollOverEnabled                        = true
 
+MenuBar.arc                                 = %arc
+MenuBar.border.margins                      = 5,0,5,0
+
 MenuItem.margin                             = 1,9,1,9
 CheckBoxMenuItem.margin                     = 1,9,1,9
 RadioButtonMenuItem.margin                  = 1,9,1,9