[Webkit-unassigned] [Bug 202183] [Win] Update KeyboardEvent as per the latest specification

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202183

--- Comment #9 from Fujii Hironori <Hironori.Fujii at sony.com> ---
If I set bit 2 of wFlags for ToUnicodeEx, it seems that ToUnicodeEx doesn't change the stored dead key.

https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-tounicodeex
> If bit 2 is set, keyboard state is not changed (Windows 10, version 1607 and newer)

Unfortunately, this behavior is supported only by Windows 10, version 1607 and newer.

And, it's not obvious to me how should I use this flag.
For example, If I type [^][a], TranslateMessage of [a] consumes the stored dead key.
So, calling ToUnicodeEx with [a] and the flag returns "a" rather than "â" because no dead key is stored.
Should I use ToUnicodeEx before TranslateMessage? Or, shouldn't I use TranslateMessage?

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