Drop async_visible and async_iconified fields of struct frame.
This is possible because async input is gone; for details, see http://lists.gnu.org/archive/html/emacs-devel/2012-12/msg00734.html. * frame.h (struct frame): Remove async_visible and async_iconified members, convert garbaged to unsigned bitfield. Adjust comments. (FRAME_SAMPLE_VISIBILITY): Remove. Adjust all users. (SET_FRAME_VISIBLE, SET_FRAME_ICONIFIED): New macros. * frame.c, gtkutil.c, term.c, w32fns.c, window.c, xdisp.c: Consistently use SET_FRAME_VISIBLE, SET_FRAME_ICONIFIED, FRAME_VISIBLE_P and FRAME_ICONIFIED_P macros where appropriate. * w32term.c: Ditto. (w32_read_socket): Save iconified state to generate DEICONIFY_EVENT properly. Likewise for obscured. * xterm.c: Ditto. (handle_one_xevent): Save visible state go generate ICONIFY_EVENT properly. * nsterm.m: Ditto. (windowDidDeminiaturize): Generate DEICONIFY_EVENT.
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