https://bugs.winehq.org/show_bug.cgi?id=57311
--- Comment #3 from Christoph Bartoschek christoph.bartoschek@gmail.com --- Before and after the mentioned commit the histogram is a child of the Image Screen as shown by info wnd in winedbg:
Wine-dbg>info wnd 0x00010a96 Window handle Class Name Style WndProc Thread Text 00010a96 AfxWnd140u 50000000 0000000000000000 00000024 Image Screen 00010a98 AfxWnd140u 40000000 0000000000000000 00000024 SNS Logout 00020aae AfxWnd140u 40000000 0000000000000000 00000024 HDR Window 00010b4a AfxWnd140u 42000000 0000000000000000 00000024 Movie Window 00030bee AfxWnd140u 50000000 0000000000000000 00000024 InfoScreen 000f0bac AfxWnd140u 50000000 0000000000000000 00000024 Histogram Scre 00010ab0 AfxWnd140u 50000000 0000000000000000 00000024 ImageFrameScre
When the Histogram is being created NtUserCreateWindowEx is called with
ex_style=0x8080020 (WS_EX_NOACTIVATE | WS_EX_LAYERED | WS_EX_TRANSPARENT) style=0x50000000 (WS_CHILD | WS_VISIBLE)
So the question for me would be why the histogram is no longer shown of if it is shown why is it empty or hidden.