richedit: do not hide or show vertical scrollbar if app hides or shows it behind our back

[Alex Villací­s Lasso]

For more details, and list to patches to apply before this one, see bug 
#12311.

Some applications (such as the one on bug #12311 <http://bugs.winehq.org/show_bug.cgi?id=12311>) have never heard of
ES_DISABLENOSCROLL and attempt to force scrollbars to be always shown (with
ShowScrollBar() or similar) when otherwise richedit would hide them. If
richedit attempts to wrestle control back, a recursive loop of requests can
result if app overrides WM_SIZE behavior. So let the app have its way. Richedit
should reclaim control when forced visibility matches default automatic
behavior.


Changelog:
* Do not hide or show vertical scrollbar if app hides or shows it behind 
our back
* Tests for this behavior.

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

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