[Bug 42038] Cannot scroll documents being compared in winmerge (Followup to bug 20695)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=42038

--- Comment #7 from Nikolay Sivov <bunglehead at gmail.com> ---
Created attachment 66202
  --> https://bugs.winehq.org/attachment.cgi?id=66202
patch

I made some progress on this. Apparently it very much depends on window
visibility state, and that's why tests didn't give results.

One remaining issue with attached patch is potentially unrelated to scrollbar
handling. The problem is that IsWindowVisible() test fails when compare views
are displayed initially. That happens because Afx:xxxx window up parent chain
does not have WS_VISIBLE style. While it does on Windows. Full chain ScrollBar
-> AfxMDIFrame -> AfxFrameOrView -> AfxMDIFrame -> Afx:xxxxx:xxxx... All
windows up to the top one on this list are "WS_VISIBLE"-visible. Anyway, with
this patch it's enough to type on char to make scrollbars responsive. Please
test and report if you see other problems with it.

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