[Bug 29857] New: GetAsyncKeyState says Escape key is permanently down once it has been pressed

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=29857

             Bug #: 29857
           Summary: GetAsyncKeyState says Escape key is permanently down
                    once it has been pressed
           Product: Wine
           Version: 1.3.28
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: silas-wine at flatline.org.uk
    Classification: Unclassified


I am debugging a Windows application that has a long-running processing thread
which periodically checks for interrupts using

GetAsyncKeyState(VK_ESCAPE) < 0

This worked fine on WINE 1.2.2, but on 1.3.28 the app kept behaving as if it
were interrupted immediately when it had not been.  Further investigation
showed that, after Escape has been pressed just once, any future calls to
GetAsyncKeyState (no matter how many events have been processed in the
meantime) always return ffff8001.  In other words, if you press Escape just
once while running your app, any future calls that app makes to
GetAsyncKeyState(VK_ESCAPE) will behave as though the Escape key is still down.
 Again this does not happen with WINE 1.2.2, only with 1.3.28.

I was able to work around this bug by adding a call to GetKeyState(VK_ESCAPE)
just before the test for GetAsyncKeyState(VK_ESCAPE) < 0.  I ignored the return
value of GetKeyState
(http://msdn.microsoft.com/en-us/library/windows/desktop/ms646301%28v=vs.85%29.aspx
says it should be called in response to a message; it doesn't say what happens
if it's called when there has been no message, so I assume we can't rely on it
to return meaningful values if called at just any time) however somehow the
presence of the GetKeyState call caused WINE 1.3.28's GetAsyncKeyState to
behave correctly.

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