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(real_this_command): New variable, but not a Lisp variable; updated like Vthis_command, but never altered by Lisp programs. (command_loop_1): Use real_this_command to set Vreal_last_command. (read_char): When input method returns no chars, call cancel_echoing. Restore the previous echo area message and this_command_keys, too. (Vinput_method_previous_message): New variable. (syms_of_keyboard): Set up lisp variable. (Qinput_method_exit_on_first_char, Qinput_method_use_echo_area): New variables. (syms_of_keyboard): Initialize them. (Fread_key_sequence): New arg COMMAND_LOOP. Bind those variables.