[Bug 31460] New: Listview LVS_EX_GRIDLINES paints thick gridlines in lists with >3855 items

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=31460

             Bug #: 31460
           Summary: Listview LVS_EX_GRIDLINES paints thick gridlines in
                    lists with >3855 items
           Product: Wine
           Version: 1.5.10
          Platform: x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: marti at juffo.org
    Classification: Unclassified


I have an application that displays very long list views. The application uses
the LVS_EX_GRIDLINES style to draw gridlines between rows/columns.

There appears to be a bug in Wine: the further down I scroll, the thicker the
horizontal gridlines get. At some point the gridlines become so thick that they
obscure the whole content of the list view (gridlines4.png). However, the
content is still temporarily visible while Wine is busy redrawing the list view
(which takes maybe a hundred milliseconds)

The first thick gridline (2 pixels high) always appears between the 3855th and
3856th items.

Using wine 1.5.10 on Arch Linux x86_64 (32-bit Windows application)

Unfortunately the application is proprietary and can't be used with an
accompanying server. If you need help reproducing this issue, I can try writing
a simple test case.

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