3 files changed, 19 insertions, 24 deletions
diff --git a/src/widgets/widgets/qcombobox.cpp b/src/widgets/widgets/qcombobox.cpp
index e38e1d7750..9a403e8eef 100644
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -80,6 +80,7 @@
 #if QT_CONFIG(effects)
 # include <private/qeffects_p.h>
 #endif
+#include <private/qstyle_p.h>
 #ifndef QT_NO_ACCESSIBILITY
 #include "qaccessible.h"
 #endif
@@ -261,16 +262,11 @@ void QComboBoxPrivate::_q_modelDestroyed()
     model = QAbstractItemModelPrivate::staticEmptyModel();
 }
 
-
-//Windows and KDE allows menus to cover the taskbar, while GNOME and Mac don't
 QRect QComboBoxPrivate::popupGeometry(int screen) const
 {
-    bool useFullScreenForPopupMenu = false;
-    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
-        useFullScreenForPopupMenu = theme->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool();
-    return useFullScreenForPopupMenu ?
-           QDesktopWidgetPrivate::screenGeometry(screen) :
-           QDesktopWidgetPrivate::availableGeometry(screen);
+    return QStylePrivate::useFullScreenForPopup()
+        ? QDesktopWidgetPrivate::screenGeometry(screen)
+        : QDesktopWidgetPrivate::availableGeometry(screen);
 }
 
 bool QComboBoxPrivate::updateHoverControl(const QPoint &pos)
diff --git a/src/widgets/widgets/qmenu.cpp b/src/widgets/widgets/qmenu.cpp
index 7dc67c8efe..14964a696d 100644
--- a/src/widgets/widgets/qmenu.cpp
+++ b/src/widgets/widgets/qmenu.cpp
@@ -78,6 +78,7 @@
 #include <private/qguiapplication_p.h>
 #include <qpa/qplatformtheme.h>
 #include <private/qdesktopwidget_p.h>
+#include <private/qstyle_p.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -307,29 +308,26 @@ int QMenuPrivate::scrollerHeight() const
     return qMax(QApplication::globalStrut().height(), q->style()->pixelMetric(QStyle::PM_MenuScrollerHeight, 0, q));
 }
 
-//Windows and KDE allow menus to cover the taskbar, while GNOME and Mac don't
+// Windows and KDE allow menus to cover the taskbar, while GNOME and macOS
+// don't. Torn-off menus are again different
+inline bool QMenuPrivate::useFullScreenForPopup() const
+{
+    return !tornoff && QStylePrivate::useFullScreenForPopup();
+}
+
 QRect QMenuPrivate::popupGeometry() const
 {
     Q_Q(const QMenu);
-    if (!tornoff && // Torn-off menus are different
-            QGuiApplicationPrivate::platformTheme() &&
-            QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool()) {
-        return QDesktopWidgetPrivate::screenGeometry(q);
-    } else {
-        return QDesktopWidgetPrivate::availableGeometry(q);
-    }
+    return useFullScreenForPopup()
+        ? QDesktopWidgetPrivate::screenGeometry(q)
+        : QDesktopWidgetPrivate::availableGeometry(q);
 }
 
-//Windows and KDE allow menus to cover the taskbar, while GNOME and Mac don't
 QRect QMenuPrivate::popupGeometry(int screen) const
 {
-    if (!tornoff && // Torn-off menus are different
-            QGuiApplicationPrivate::platformTheme() &&
-            QGuiApplicationPrivate::platformTheme()->themeHint(QPlatformTheme::UseFullScreenForPopupMenu).toBool()) {
-        return QDesktopWidgetPrivate::screenGeometry(screen);
-    } else {
-        return QDesktopWidgetPrivate::availableGeometry(screen);
-    }
+    return useFullScreenForPopup()
+        ? QDesktopWidgetPrivate::screenGeometry(screen)
+        : QDesktopWidgetPrivate::availableGeometry(screen);
 }
 
 QVector<QPointer<QWidget> > QMenuPrivate::calcCausedStack() const
diff --git a/src/widgets/widgets/qmenu_p.h b/src/widgets/widgets/qmenu_p.h
index 12521e7a36..1821181535 100644
--- a/src/widgets/widgets/qmenu_p.h
+++ b/src/widgets/widgets/qmenu_p.h
@@ -349,6 +349,7 @@ public:
     void updateActionRects(const QRect &screen) const;
     QRect popupGeometry() const;
     QRect popupGeometry(int screen) const;
+    bool useFullScreenForPopup() const;
     int getLastVisibleAction() const;
 
     //selection