[Bug 40810] Semcad X Verision 14 (64bit): crashes when opening a 2D plot

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40810

--- Comment #34 from Dmitry Timoshkov <dmitry at baikal.ru> ---
Created attachment 54947
  --> https://bugs.winehq.org/attachment.cgi?id=54947
patch3

Here is another patch for testing, other patches should not be applied.

After looking at the attached backtraces once again I've created a test case
that passes invalid arguments to GdipDrawString in a similar way the app
(mis)uses the API. To my surprise the test was always crashing under Windows
(both 32 and 64-bit builds). Then I added another step - wrapped a crashing
logic in EnumMetafile API, assuming that it may have an exception handler
around the called application provided callback: that test was also crashing.
Then I've wrapped the crashing test in the window procedure, and that worked,
but only for WM_PAINT messages (and the backtrace shows a crash in WM_PAINT
handler). As another step I've added a test that calls CallWindowProcA/W,
SendMessageA/W and DispatchMessageA/W in a loop with messages from 0 to 0x1000
with a window procedure intentionally crashing on a NULL pointer. In my tests
there are 2 things that survive the crashes in the window procedure:
CreateWindowEx and DispatchMessageA/W(WM_PAINT).

So it looks like the crashes were left unnoticed by an application developer
because Windows silently handles them during WM_PAINT message dispatching.

Please let me know the results with only this patch applied.

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