3 files changed, 12 insertions, 0 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index ffee8528f0..b545844a24 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -49,6 +49,7 @@
 #include <QtCore/qfileinfo.h>
 #include <QtCore/private/qcore_mac_p.h>
 #include <qwindow.h>
+#include <private/qwindow_p.h>
 #include <qpa/qwindowsysteminterface.h>
 #include <qpa/qplatformscreen.h>
 
@@ -649,6 +650,10 @@ void QCocoaWindow::recreateWindow(const QPlatformWindow *parentWindow)
         NSRect frame = NSMakeRect(rect.x(), rect.y(), rect.width(), rect.height());
         [m_contentView setFrame:frame];
     }
+
+    const qreal opacity = qt_window_private(window())->opacity;
+    if (!qFuzzyCompare(opacity, qreal(1.0)))
+        setOpacity(opacity);
 }
 
 NSWindow * QCocoaWindow::createNSWindow()
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 1f6253438f..2f2588bc4a 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -731,6 +731,9 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const WindowData &data) :
     if (QWindowsContext::instance()->systemInfo() & QWindowsContext::SI_SupportsTouch)
         QWindowsContext::user32dll.registerTouchWindow(m_data.hwnd, 0);
     setWindowState(aWindow->windowState());
+    const qreal opacity = qt_window_private(aWindow)->opacity;
+    if (!qFuzzyCompare(opacity, qreal(1.0)))
+        setOpacity(opacity);
 }
 
 QWindowsWindow::~QWindowsWindow()
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 0db4176607..23e59f0735 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -385,6 +385,10 @@ void QXcbWindow::create()
 #ifndef QT_NO_DRAGANDDROP
     connection()->drag()->dndEnable(this, true);
 #endif
+
+    const qreal opacity = qt_window_private(window())->opacity;
+    if (!qFuzzyCompare(opacity, qreal(1.0)))
+        setOpacity(opacity);
 }
 
 QXcbWindow::~QXcbWindow()