Fix C-x 5 2 on the controlling tty; fix some possible crash conditions and a memory leak.
* src/frame.c (make_terminal_frame): Don't create frames on a terminal that is being deleted. * src/xfns.c (Fx_create_frame, x_create_tip_frame): Ditto. * src/keyboard.c (tty_read_avail_input): Don't read from a terminal that is being deleted. * src/term.c (get_named_tty): Abort if tty name is NULL. Simplify accordingly. * src/term.c (Ftty_type): Return nil if terminal is not on a tty instead of throwing an error. Doc update. * src/term.c (init_tty): Set name before calling `get_named_tty'. * src/term.c (delete_tty): Let delete_terminal delete the frames. Plug memory leak caused by tty->name. Remove reference to `deleting_tty'. * src/term.c (syms_of_term) <Vsuspend_tty_functions, Vresume_tty_functions>: Doc update. * src/termhooks.h (terminal) <name>: Explain why identifying terminals by name is a bad idea. * src/terminal.c (delete_terminal): Doc update. * src/xterm.c (XTread_socket): Disable loop on all X displays. * src/xterm.c (x_delete_display): Doc update to reflect changes in delete_terminal. * src/xterm.c (x_delete_terminal): Don't set terminal->deleted and let delete_terminal delete the frames on the terminal. * src/xterm.h (x_display_info) <terminal>: Move member earlier in the struct. git-archimport-id: firstname.lastname@example.org/emacs--multi-tty--0--patch-565
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