richedit: Clicking below end of text now selects closest character

[Dylan Smith]

Before, the end of the text was selected when clicking below the end
of the text, rather than using the x position to find the appropriate
character on the last row that is closest to the pixel position.

This behaviour was observed in wordpad on Windows XP, and EM_CHARFROMPOS
is documented on MSDN as getting information about the character closest
to a specified point.
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 dlls/riched20/caret.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
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