USER32: result of ScrollBar functions review (4th try)

[Vitaly Lipatov]

ScrollBar fix again.
It has not my previous bug with ESB_DISABLE_BOTH
(thanks Andrew Johnston)

It hasn't a regression during my visual testing in some programs.

ChangeLog
  fix scrollbar show/update conditions in SCROLL_SetScrollInfo: we DO NOT show 
scroll bar if only page parameter changing when scrollbar is disabled
 removed  bChangeParams from SCROLL_SetScrollInfo as unneeded flag.
  rewrite SCROLL_GetScrollBarInfo in to
SCROLL_GetInternalInfo and SCROLL_NewInternalInfo functions

P.S.
Please feel free to send me a notation if you dislike my changes.

--
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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