user32: Check WS_CHILD style in IsChild function (try2)

[Piotr Caban]

try2:
  - added more tests (with windows between child and parent)

---
  dlls/user32/tests/win.c | 13 +++++++++++++
  dlls/user32/win.c       | 18 +++++++++++++-----
  2 files changed, 26 insertions(+), 5 deletions(-)


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