macOS: Use [NSObject superclass] instead of class_getSuperclass

The former takes into account dynamically generated key-value-observing
(KVO) subclasses, of the form NSKVONotifying_*, which would result in
class_getSuperclass returning QNSWindow and recursing back to the original
call site of qt_objcDynamicSuper.

Change-Id: I4b8b1aa64d2834d9d1baa395c877319e99084bc8
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.h b/src/plugins/platforms/cocoa/qcocoahelpers.h
index 1f4f9cd276..7810733255 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.h
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.h
@@ -223,7 +223,7 @@ ReturnType qt_msgSendSuper(id receiver, SEL selector, Args... args)
 
     typedef ReturnType (*SuperFn)(objc_super *, SEL, Args...);
     SuperFn superFn = reinterpret_cast<SuperFn>(objc_msgSendSuper);
-    objc_super sup = { receiver, class_getSuperclass(object_getClass(receiver)) };
+    objc_super sup = { receiver, [receiver superclass] };
     return superFn(&sup, selector, args...);
 }
 
@@ -236,7 +236,7 @@ ReturnType qt_msgSendSuper_stret(id receiver, SEL selector, Args... args)
     typedef void (*SuperStretFn)(ReturnType *, objc_super *, SEL, Args...);
     SuperStretFn superStretFn = reinterpret_cast<SuperStretFn>(objc_msgSendSuper_stret);
 
-    objc_super sup = { receiver, class_getSuperclass(object_getClass(receiver)) };
+    objc_super sup = { receiver, [receiver superclass] };
     ReturnType ret;
     superStretFn(&ret, &sup, selector, args...);
     return ret;