[PATCH] user32: Allow scrollbar control to store scroll info in subclassed window.

[Jacek Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46004
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45966
Signed-off-by: Jacek Caban 
---
 dlls/user32/scroll.c       | 35 +++++++++++++++++++++++++++++------
 dlls/user32/tests/scroll.c |  1 -
 2 files changed, 29 insertions(+), 7 deletions(-)