* keyboard.c (Vlast_event_frame): Make this variable exist even
when MULTI_FRAME isn't #defined. People might find it necessary for writing correct programs, even when the programs don't explicitly use multiple frames. (read_char, kbd_buffer_store_event, kbd_buffer_get_event): No need to test MULTI_FRAME before setting Vlast_event_frame. (syms_of_keyboard): DEFVAR Vlast_event_frame whether or not MULTI_FRAME is defined. * keyboard.c: Add switch-frame events. (Qswitch_frame): New event header symbol. (head_table): Include Qswitch_frame in the table of event heads. (kbd_buffer_get_event): Detect when a frame switch has occurred, and return a frame switch event before the enqueued event. (make_lispy_switch_frame): New function. (unread_switch_frame): New variable. (read_key_sequence): Don't throw away the key sequence if the user switches frames in the middle of the sequence. Instead, when we receive a switch-frame event in the middle of a key sequence, save it, and stuff it into unread_switch_frame when the sequence is complete. (read_char): If unread_switch_frame is set, return that value. (command_loop_1): No need to check Vlast_event_frame and select new frames here; that's taken care of by switch-frame events now. (syms_of_keyboard): Initialize and staticpro unread_switch_frame. * keyboard.c (follow_key, read_key_sequence): Call access_keymap with T_OK true. * keyboard.c (apply_modifiers): Copy the value of BASE's Qevent_kind property to the new symbol. * keyboard.c (syms_of_keyboard): Qevent_kind should be initialized to intern ("event-kind"), not intern ("event-type").
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