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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: =?gb18030?B?u9i4tKO6ILvYuLSjuiC72Li0o7ogu9i4tKO6?= [PATCH] Add
 IME status change support on windows natively
Date: Mon, 13 Apr 2020 10:25:48 +0300
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> Date: Mon, 13 Apr 2020 10:21:50 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> So perhaps instead of using w32_system_caret_hwnd, you should use the
> return value of GetFocus function, similar to what we do elsewhere in
> w32_msg_pump.

And if GetFocus returns NULL, skip the processing, like you do if
get_ime_context_fn returns NULL.