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diff --git a/src/plugins/platforms/cocoa/qnsview_menus.mm b/src/plugins/platforms/cocoa/qnsview_menus.mm
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// This file is included from qnsview.mm, and only used to organize the code
+
+#include <qcocoaapplicationdelegate.h>
+#include <qcocoansmenu.h>
+#include <qcocoamenuitem.h>
+#include <qcocoamenu.h>
+#include <qcocoamenubar.h>
+
+static bool selectorIsCutCopyPaste(SEL selector)
+{
+    return (selector == @selector(cut:)
+            || selector == @selector(copy:)
+            || selector == @selector(paste:)
+            || selector == @selector(selectAll:));
+}
+
+@interface QT_MANGLE_NAMESPACE(QNSView) (Menus)
+- (void)qt_itemFired:(QCocoaNSMenuItem *)item;
+@end
+
+@implementation QT_MANGLE_NAMESPACE(QNSView) (Menus)
+
+- (BOOL)validateMenuItem:(NSMenuItem*)item
+{
+    auto *nativeItem = qt_objc_cast<QCocoaNSMenuItem *>(item);
+    if (!nativeItem)
+        return item.enabled; // FIXME Test with with Qt as plugin or embedded QWindow.
+
+    auto *platformItem = nativeItem.platformMenuItem;
+    if (!platformItem)
+        return NO;
+
+    // Menu-holding items are always enabled, as it's conventional in Cocoa
+    if (platformItem->menu())
+        return YES;
+
+    // Check if a modal dialog is active. Validate only menu
+    // items belonging to this view's window own menu bar.
+    if (QGuiApplication::modalWindow()) {
+        QCocoaMenuBar *menubar = nullptr;
+
+        QObject *menuParent = platformItem->menuParent();
+        while (menuParent && !(menubar = qobject_cast<QCocoaMenuBar *>(menuParent))) {
+            auto *menuObject = dynamic_cast<QCocoaMenuObject *>(menuParent);
+            menuParent = menuObject->menuParent();
+        }
+
+        if (menubar && menubar->cocoaWindow() != self.platformWindow)
+            return NO;
+    }
+
+    return platformItem->isEnabled();
+}
+
+- (BOOL)respondsToSelector:(SEL)selector
+{
+    // Not exactly true. Both copy: and selectAll: can work on non key views.
+    if (selectorIsCutCopyPaste(selector))
+        return ([NSApp keyWindow] == self.window) && (self.window.firstResponder == self);
+
+    return [super respondsToSelector:selector];
+}
+
+- (void)qt_itemFired:(QCocoaNSMenuItem *)item
+{
+    auto *appDelegate = [QCocoaApplicationDelegate sharedDelegate];
+    [appDelegate qt_itemFired:item];
+}
+
+- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
+{
+    if (selectorIsCutCopyPaste(selector)) {
+        NSMethodSignature *itemFiredSign = [super methodSignatureForSelector:@selector(qt_itemFired:)];
+        return itemFiredSign;
+    }
+
+    return [super methodSignatureForSelector:selector];
+}
+
+- (void)forwardInvocation:(NSInvocation *)invocation
+{
+    if (selectorIsCutCopyPaste(invocation.selector)) {
+        NSObject *sender;
+        [invocation getArgument:&sender atIndex:2];
+        if (auto *nativeItem = qt_objc_cast<QCocoaNSMenuItem *>(sender)) {
+            [self qt_itemFired:nativeItem];
+            return;
+        }
+    }
+
+    [super forwardInvocation:invocation];
+}
+
+@end