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While messing around with the Windows WM_NCPAINT message, I forced the WindowProc to return without calling DefWindowProc.
This resulted in interesting effects when pressing mouse buttons down on the right hand side of the title bar. This is on Windows 10.
Bottom part of the image is when I clicked on things and is Windows 9x-XP style. Top part of the image is when the window was deactivated and is Vista/Windows 7 style. Once they appear, the buttons behave as they did (visually - e.g. highlighting) as they did on those versions of Windows.
Just found it funny to see older bits of the Windows UI still hanging around behind the scenes!
random
legacy
wm_ncpaint
windows