qt5-qtbase/qtbase-opensource-src-5.5-disconnect_displays.patch

--- a/src/gui/kernel/qwindow.cpp	2015-10-30 06:20:01.000000000 -0200
+++ b/src/gui/kernel/qwindow.cpp	2015-11-05 11:31:10.544561171 -0200
@@ -373,15 +373,14 @@
         return;
     }
     if (newScreen != topLevelScreen) {
-        const bool shouldRecreate = recreate && windowRecreationRequired(newScreen);
-        const bool shouldShow = visibilityOnDestroy && !topLevelScreen;
+        const bool shouldRecreate = recreate/* && windowRecreationRequired(newScreen)*/;
         if (shouldRecreate && platformWindow)
             q->destroy();
         connectToScreen(newScreen);
-        if (shouldShow)
-            q->setVisible(true);
-        else if (newScreen && shouldRecreate)
+        if (newScreen && shouldRecreate) {
             create(true);
+            q->setVisible(visibilityOnDestroy);
+        }
         emitScreenChangedRecursion(newScreen);
     }
 }