USER32: result of ScrollBar functions review

[Vitaly Lipatov]

I debug some program where under WINE we have scrollbar always showed
in custom window and made some change during review of scroll.c code..
Old SCROLL_GetScrollBarInfo (crossed by name with WinAPI function) is renamed 
to SCROLL_GetInternalInfo. SCROLL_GetInternalInfo returns pointer to the 
struct only if it already exist. For create struct with scroll bar internal 
information we are using SCROLL_NewInternalInfo.
Now we update scroll bar state if we set range first time for value the same 
as default value. We DO NOT show scroll bar if only page parameter changing 
(check the current state with isShow flag).

When I have learned how to write test I will introduce it :)

ChangeLog
  implemented SCROLLBARINFO struct
  implemented SBM_GETSCROLLBARINFO message
  implemented GetScrollBarInfo function
  fix scrollbar show/update conditions
  add isShow flag in SCROLLBAR_INFO
  rename, separate and rewrite SCROLL_GetScrollBarInfo in to 
SCROLL_GetInternalInfo and SCROLL_NewInternalInfo functions

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