Postpone resetting SCROLL_TrackingWin untill all notifications are sent

[Dmitry Timoshkov]

Hello,

the app I'm working on calls GetScrollInfo on each WM_VSCROLL
SB_THUMBPOSITION notification and only then updates scroll position.
The problem is that current code resets SCROLL_TrackingWin before
sending SB_THUMBPOSITION notification, but SCROLL_GetScrollInfo checks
SCROLL_TrackingWin before it sets nTrackPos, therefore the app sets
scroll position to 0.

I've written a test app which shows that on SB_THUMBPOSITION
notification GetScrollInfo under Windows returns nTrackPos set to
current tracked value, under Wine currently it returns 0.

Changelog:
    Postpone resetting SCROLL_TrackingWin until all notifications
    are sent.

-- 
Dmitry.
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