1 files changed, 10 insertions, 1 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 7a19303f5d..6cdabf606b 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -588,7 +588,16 @@ void QCocoaWindow::setWindowFlags(Qt::WindowFlags flags)
         }
         setWindowZoomButton(flags);
 
-        m_view.window.ignoresMouseEvents = flags & Qt::WindowTransparentForInput;
+        // Make window ignore mouse events if WindowTransparentForInput is set.
+        // Note that ignoresMouseEvents has a special initial state where events
+        // are ignored (passed through) based on window transparency, and that
+        // setting the property to false does not return us to that state. Instead,
+        // this makes the window capture all mouse events. Take care to only
+        // set the property if needed. FIXME: recreate window if needed or find
+        // some other way to implement WindowTransparentForInput.
+        bool ignoreMouse = flags & Qt::WindowTransparentForInput;
+        if (m_view.window.ignoresMouseEvents != ignoreMouse)
+            m_view.window.ignoresMouseEvents = ignoreMouse;
     }
 
     m_windowFlags = flags;