(kbd_buffer_frame_or_window): Restored old var.
(kbd_buffer, kbd_fetch_ptr, kbd_store_ptr): Likewise. (read_char_perdisplay): New var. (read_char): Search all appropriate perdisplay objects, and do the right thing if the next event comes from a different source. (read_key_sequence): If there's a change of display in mid-stream, retreat and try reading the new display. (find_active_event_queue): Function deleted. All callers changed to just test the main kbd_buffer instead. (kbd_buffer_store_event): Write to the main kbd_buffer again. (kbd_buffer_get_event): Read from the main kbd_buffer again. Now returns a perdisplay pointer in addition to a lispy event. (Fdiscard_input, swallow_events): Use the main kbd_buffer again. (stuff_buffered_input): Likewise. (init_perdisplay): Initialize member kbd_queue. Remove references to obsolete members. (wipe_perdisplay): Remove obsolete reference. (init_keyboard, syms_of_keyboard): Restore initialization of vars.
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