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Return previous overlay end.
(Foverlays_at): Pass NULL for last 2 args of overlays_at.
(Fnext_overlay_change): Pass new arg to overlays_at.
(Fprevious_overlay_change): New function.

window borders.
* buffer.c (syms_of_buffer): Update doc string for
`buffer-display-table'.
* disptab.h (DISP_TABLE_SIZE): Bump to 262.
(DISP_BORDER_GLYPH): New accessor macro.
* xdisp.c (display_text_line): Consult the display table when
building side-by-side window borders.

(Fget_buffer_create): Call it here.
(init_buffer_once): And here.

(syms_of_buffer): Initialize it.
(Fmove_overlay): Check if overlay is empty.
(Foverlay_put): Check if setting evaporate property on empty overlay.
(evaporate_overlays): New function.

(init_buffer_once): Use EMACS_INT.

Don't put in a C-d unless a single line is too long.
Read process input whenever output gets stuck.
Relocate BUF if we read input.  New arg OBJECT.
(Fprocess_send_region, Fprocess_send_string, process_send_signal)
(Fprocess_send_eof): Pass new arg OBJECT.

if it didn't come from this Emacs session.

changing to a different buffer.

Avoid copying tail twice.

(Fnext_overlay_change): Doc fix.

(syms_of_buffer): Fix typo in previous change.

(syms_of_buffer): Doc fix.

and Vascii_canon_table.

(syms_of_buffer): Set up Lisp vars.

intersects the overlay.

Copy TAIL before a hook, in case the hook recenters the overlay lists.

of function, to avoid confusing make-docfile.

Don't call Vrun_hooks if it is nil.