Fixed tty faces during combo sessions. Plus other assorted bugfixes.
lisp/startup.el (command-line): Always call tty-register-default-colors. src/dispextern.h (delete_tty): Added missing prototype. src/keyboard.c (read_avail_input): Close display gracefully if needed. Kill Emacs if the last display is to be closed. (tty_read_avail_input): Don't call delete_tty and don't signal hangup here; return -2 instead to indicate the non-transient failure to read_avail_input. src/term.c (delete_tty): Removed superflous wiping of the deleted frames' output_data field. (delete_display): Check for and close live frames that are still on the display. src/termhooks.h (read_socket_hook, delete_display_hook): Added detailed comment. src/xfaces.c (realize_face): Create a dummy face for the initial frame. (Reported by Robert J. Chassell (bob at rattlenake dot com).) git-archimport-id: firstname.lastname@example.org/emacs--multi-tty--0--patch-61
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