user32: Ignore WM_CHILDACTIVATE on disabled windows in DefMDIChildProc.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
---
 dlls/user32/mdi.c       |  3 ++-
 dlls/user32/tests/msg.c | 66
+++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)


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