Bug 899: Validate whether we propagate WNDPROC as retrieved from 'getDummyWndProc0()' in RegisteredClassFactory - Result: Yes we do.

GDI.initSingleton() dummyWindowClassFactory RegisteredClassFactory[moduleHandle 0x13f3e0000, _dummyWindow_clazz, wndProc 0x6c101de6, shared[refCount 0, class null]]

GDI.CreateDummyWindow() dummyWindowClassFactory RegisteredClassFactory[moduleHandle 0x13f3e0000, _dummyWindow_clazz, wndProc 0x6c101de6, shared[refCount 1, class RegisteredClass[handle 0x13f3e0000, _dummyWindow_clazz0]]]
GDI.CreateDummyWindow() dummyWindowClass RegisteredClass[handle 0x13f3e0000, _dummyWindow_clazz0]

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Note: The RegisteredClassFactory mechanism is used for NEWT Windows as well.