user32: Don't do the painting if combobox is not visible in CBPaintText

[Piotr Caban]

This patch fixes regression reported in bug 43920.

Signed-off-by: Piotr Caban <piotr at codeweavers.com>
---
  dlls/user32/combo.c     |  2 +-
  dlls/user32/tests/msg.c | 19 +++++++++++++++++++
  2 files changed, 20 insertions(+), 1 deletion(-)


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