Fix bug #14841 with invisible frames on MS-Windows.
src/w32term.c (w32_read_socket) <WM_EMACS_PAINT>: Warn about frame being re-exposed only if it didn't ask to become visible. <WM_SIZE>: Under SIZE_RESTORED, only set the frame visible if it was previously iconified. (x_iconify_frame): Mark the frame iconified.
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