Deprecate Qt::MacWindowToolBarButtonHint

It is an old remnant from the Carbon port, and has been a no-op since
Qt 5.

[ChangeLog][macOS] The Qt::MacWindowToolBarButtonHint flag has been
deprecated, as it has been a no-op since Qt 5.

Task-number: QTBUG-127634
Change-Id: Ibe0dee5bea423a2fd320806d2751326b3e4a4508
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/corelib/global/qnamespace.h

@@ -240,7 +240,10 @@ namespace Qt {
         CustomizeWindowHint = 0x02000000,
         WindowStaysOnBottomHint = 0x04000000,
         WindowCloseButtonHint = 0x08000000,
-        MacWindowToolBarButtonHint = 0x10000000,
+#if QT_DEPRECATED_SINCE(6, 9)
+        MacWindowToolBarButtonHint Q_DECL_ENUMERATOR_DEPRECATED_X(
+            "This flag has been a no-op since Qt 5") = 0x10000000,
+#endif
         BypassGraphicsProxyWidget = 0x20000000,
         NoDropShadowWindowHint = 0x40000000,
         WindowFullscreenButtonHint = 0x80000000

src/corelib/global/qnamespace.qdoc

@@ -2302,8 +2302,7 @@
     \value WindowContextHelpButtonHint  Adds a context help button to dialogs.
            On some platforms this implies Qt::WindowSystemMenuHint for it to work.
 
-    \value MacWindowToolBarButtonHint On \macos adds a tool bar button (i.e.,
-           the oblong button that is on the top right of windows that have toolbars).
+    \omitvalue MacWindowToolBarButtonHint
 
     \value WindowFullscreenButtonHint On \macos adds a fullscreen button.
 

tests/manual/diaglib/qwindowdump.cpp

@@ -79,7 +79,6 @@ void formatWindowFlags(QTextStream &str, Qt::WindowFlags flags)
     debugFlag(str, flags, Qt::NoDropShadowWindowHint)
     debugFlag(str, flags, Qt::WindowFullscreenButtonHint)
     debugFlag(str, flags, Qt::WindowStaysOnBottomHint)
-    debugFlag(str, flags, Qt::MacWindowToolBarButtonHint)
     debugFlag(str, flags, Qt::BypassGraphicsProxyWidget)
 }