Mark some Qt namespace enum members properly as deprecated

A comment is not good enough, Some of the enum members were even still
in use, or mentioned in documentation.

WA_ContentsPropagated, WA_WState_DND and WA_ForceAcceptDrops have been
deprecated since 4.5.1; and at least the last has been an \omitvalue
in the docs for even longer.  (WA_ShowModal and WA_GroupLeader have
been similarly marked, but are in use, see QTBUG-85816.)

Push back to 5.15.1 in order to be able to remove these at Qt 6.

Pick-to: 5.15.1
Change-Id: I6ea3839767e5f5158b0fed508f65798470191908
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/corelib/global/qnamespace.h

@@ -308,7 +308,9 @@ namespace Qt {
         WA_Disabled = 0,
         WA_UnderMouse = 1,
         WA_MouseTracking = 2,
-        WA_ContentsPropagated = 3, // ## deprecated
+#if QT_DEPRECATED_SINCE(5, 15) // commented as such since 4.5.1
+        WA_ContentsPropagated Q_DECL_ENUMERATOR_DEPRECATED = 3,
+#endif
         WA_OpaquePaintEvent = 4,
 #if QT_DEPRECATED_SINCE(5, 14)
         WA_NoBackground Q_DECL_ENUMERATOR_DEPRECATED = WA_OpaquePaintEvent,
@@ -363,14 +365,16 @@ namespace Qt {
         WA_WState_Reparented = 63,
         WA_WState_ConfigPending = 64,
         WA_WState_Polished = 66,
-        WA_WState_DND = 67, // ## deprecated
+#if QT_DEPRECATED_SINCE(5, 15) // commented as such in 4.5.1
+        WA_WState_DND Q_DECL_ENUMERATOR_DEPRECATED = 67,
+#endif
         WA_WState_OwnSizePolicy = 68,
         WA_WState_ExplicitShowHide = 69,
 
-        WA_ShowModal = 70, // ## deprecated
+        WA_ShowModal = 70, // ## deprecated since since 4.5.1 but still in use :-(
         WA_MouseNoMask = 71,
-        WA_GroupLeader = 72, // ## deprecated
-        WA_NoMousePropagation = 73, // ## for now, might go away.
+        WA_GroupLeader = 72, // ## deprecated since since 4.5.1 but still in use :-(
+        WA_NoMousePropagation = 73, // for now, might go away.
         WA_Hover = 74,
         WA_InputMethodTransparent = 75, // Don't reset IM when user clicks on this (for virtual keyboards on embedded)
         WA_QuitOnClose = 76,
@@ -379,7 +383,9 @@ namespace Qt {
 
         WA_AcceptDrops = 78,
         WA_DropSiteRegistered = 79, // internal
-        WA_ForceAcceptDrops = WA_DropSiteRegistered, // ## deprecated
+#if QT_DEPRECATED_SINCE(5, 15) // commented as such since 4.5.1
+        WA_ForceAcceptDrops Q_DECL_ENUMERATOR_DEPRECATED_X("WA_ForceAcceptDrops is deprecated. Use WA_DropSiteRegistered instead") = WA_DropSiteRegistered,
+#endif
 
         WA_WindowPropagation = 80,
 

src/plugins/styles/windowsvista/qwindowsxpstyle.cpp

@@ -1155,9 +1155,6 @@ void QWindowsXPStyle::polish(QWidget *widget)
         widget->setWindowOpacity(0.6);
     }
 #endif
-    if (qobject_cast<QStackedWidget*>(widget) &&
-               qobject_cast<QTabWidget*>(widget->parent()))
-        widget->parentWidget()->setAttribute(Qt::WA_ContentsPropagated);
 
     Q_D(QWindowsXPStyle);
     if (!d->hasInitColors) {

src/widgets/kernel/qwidget.cpp

@@ -715,8 +715,7 @@ void QWidget::setAutoFillBackground(bool enabled)
     is no need to write double-buffering code in paintEvent() to avoid
     flicker.
 
-    Since Qt 4.1, the Qt::WA_ContentsPropagated widget attribute has been
-    deprecated. Instead, the contents of parent widgets are propagated by
+    Since Qt 4.1, the contents of parent widgets are propagated by
     default to each of their children as long as Qt::WA_PaintOnScreen is not
     set. Custom widgets can be written to take advantage of this feature by
     updating irregular regions (to create non-rectangular child widgets), or

src/widgets/widgets/qdockwidget.cpp

@@ -754,8 +754,6 @@ void QDockWidgetPrivate::updateButtons()
     button->setAccessibleName(QDockWidget::tr("Close"));
     button->setAccessibleDescription(QDockWidget::tr("Closes the dock widget"));
 #endif
-    q->setAttribute(Qt::WA_ContentsPropagated,
-                    (canFloat || canClose) && !hideButtons);
 
     layout->invalidate();
 }

tests/auto/widgets/styles/qmacstyle/tst_qmacstyle.cpp

@@ -189,7 +189,6 @@ void tst_QMacStyle::sizeHints()
     QDateTimeEdit dateTime1(&w);
     QCOMPARE(sh(&dateTime1).height(), h1);
 
-    ok1.setAttribute(Qt::WA_MacMetalStyle, true);
     QSize s2 = sh(&ok1);
     if (size == Normal) {
         QVERIFY(s2.height() >= 21 && s2.height() <= 32);