richedit: EM_POSFROMCHAR should take into account scrollbar position. With tests.

[Alex Villací­s Lasso]

Fixes bug #13864. Should apply after "richedit: (9/8) EM_POSFROMCHAR 
tests (resend)".

Changelog:
* EM_POSFROMCHAR should make use of the scrollbar position when 
reporting a character position.
* Tests for this behavior.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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