[v7 5/6] user32: Send WM_NCPAINT and WM_ERASEBKGND when window is shown and add tests

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=28573

Your paranoid android.


=== w7u (32 bit msg) ===
msg.c:5233: Test failed: RedrawWindow:show_popup_extreme_location: 12: the msg 0x001c was expected, but got msg 0x0085 instead