[8/44] 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.  This behaviour is further demonstrated by the added test.
---
 dlls/riched20/caret.c        |   14 ++++++++++++++
 dlls/riched20/tests/editor.c |   19 +++++++++++++++++++
 2 files changed, 33 insertions(+), 0 deletions(-)
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