[PATCH] twain_32: Fix crash by call TWAIN_UserSelect twice.

[Jactry Zeng]

Hi,

On 6/1/21 9:22 PM, Jiajin Cui wrote:
>  
>      twain_autodetect();
>  
> +    if (!IsWindow(parent))
> +        parent = *(HWND*)DSM_parent;
> +
If this is true, you would need to remove the following check.
And I think attaching some tests to verify it won't hurt.
>      if (!IsWindow(parent))
>          parent = NULL;

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