[1/4] user32: Add test case for basic {Begin,,End}DeferWindowPos() (try 2)

[Rodrigo Rivas]

As requested in (try 1) I've split the patch in 4 parts:

1/4: It adds a basic test case for the DWP functions when all goes well.
2/4: It adds a test case (todo_wine) for the error handling of using
an invalid HWND.
3/4: It adds a test case (todo_wine) for the error handling of a HWND
that is destroyed just before callind EDWP.
4/4: It fixes the error handling to match the Windows behaviour and
removes the todo_wine's.

Basically, all that this fix does is moving the HWND checks from EDWP to DWP.

This fixes bug #23187.

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 dlls/user32/tests/win.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
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