[3/4] richedit: Prevent EN_UPDATE notifications when window isn't visible.

[Dylan Smith]

This is a fix for bug 11997, where the EN_UPDATE notification was
causing an error message to be displayed, but this notification wasn't
being sent for native richedit.
---
 dlls/riched20/paint.c        |    2 ++
 dlls/riched20/tests/editor.c |    2 +-
 2 files changed, 3 insertions(+), 1 deletions(-)
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