[SDL] bug with keyboard modifiers on win32

[Astronomy]

There appears to be a bug with keyboard modifier
states on win32. The issue occurs when one alt-tabs
(or, presumably, alt-esc or ctrl-esc, etc.) away from
an SDL application. Upon returning focus to that
application, the SDL_KEYDOWN events all carry
KMOD_ALT, even though ALT is no longer held. Pressing
and releasing ALT restores the state correctly.

PS. I love SDL! Thank you!

Cheers,

 Tom

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