According to a comment, this hook "Seems only used by lazy-lock.
I.e. obsolete." But lazy-lock has been deleted.
* lisp/outline.el (outline-view-change-hook): Make obsolete.
* lisp/pixel-scroll.el (pixel-scroll-start-momentum): Bump GC
cons threshold temporarily. This leads to a very noticable
improvement to animation speed.
* src/xterm.c (x_if_event): New function, like XIfEvent but with
a timeout.
(x_sync_wait_for_frame_drawn_event): Disable frame
synchronization if x_if_event times out after 1 second.
* src/xdisp.c (get_narrowed_begv, get_narrowed_zv): Add 'pos'
parameter.
(init_iterator): Add arguments to 'get_narrowed_begv' and
'get_narrowed_zv'.
(handle_fontified_prop): Recompute the narrowing when iterator
has moved outside of narrowing bounds.
* src/dispextern.h (get_narrowed_begv, get_narrowed_zv): Adapt
prototypes.
* src/composite.c (find_automatic_composition): Add argument
to 'get_narrowed_begv'.
* src/xterm.c (x_sync_wait_for_frame_drawn_event): Don't wait if
the frame is invisible. If it is mapped again the compositing
manager is obliged to send us another event, so we can wait in
that case.
(x_sync_update_begin, x_sync_update_finish): Handle extended
resize synchronization here.
(XTframe_up_to_date, handle_one_xevent): Save stuff here.
* src/xterm.h (struct x_output): New field
`resize_counter_value'.
* lisp/outline.el (outline-minor-mode-highlight-buffer): Factor
out... (bug#56820).
(outline--use-buttons-p): ... to here.
(outline-hide-subtree, outline--fix-up-all-buttons)
(outline-show-subtree): Use it.
* src/xfns.c (x_set_parent_frame, Fx_create_frame): Disable
vsync on child and embedded frames.
* src/xmenu.c (x_menu_show): Fix XMenu position calculation in
child frames.
* src/xterm.c (x_sync_is_frame_drawn_event)
(x_sync_wait_for_frame_drawn_event): New functions.
(x_sync_update_begin): Wait for frame to be drawn if not double
buffered.
(x_sync_update_finish): Set FRAME_X_WAITING_FOR_DRAW (f).
(show_back_buffer): Wait for frame to be drawn before flipping
buffers.
(XTframe_up_to_date): Set FRAME_X_WAITING_FOR_DRAW if bumped.
(handle_one_xevent): Handle frame drawn events.
* src/xterm.h (struct x_output): New fields for frame dirtyness
and vsync.
* src/xterm.c (x_atom_refs): New atom _NET_WM_FRAME_TIMINGS.
(x_sync_update_finish, x_sync_update_begin): New frame.
(x_update_begin, x_update_end, XTframe_up_to_date): Begin and
end frames accordingly if extended frame synchronization is
enabled.
(handle_one_xevent): Ignore timing and frame drawn events.
* src/xterm.h (struct x_display_info): New atom.
(FRAME_X_COUNTER_VALUE): New macro.
* lisp/select.el (xselect-dnd-target-available-p): New function.
(selection-converter-alist): Register it as the availability
function for DND specific targets.
* src/editfns.c (Fnarrow_to_region): Add the parameter to the
function, and handle it. Update docstring.
(unwind_locked_begv, unwind_locked_zv): New functions.
(Fwiden): Do nothing when restrictions are locked. Update
docstring.
(syms_of_editfns): Replace the 'inhibit-widen' symbol and variable
with a 'restrictions-locked' symbol and variable. Update docstring.
* src/xdisp.c (handle_fontified_prop): Use Fnarrow_to_region with
the new parameter.
(unwind_narrowed_zv): Remove function.
* src/process.c (Finternal_default_process_filter): Add a third
argument to Fnarrow_to_region.
* src/lread.c (readevalloop): Add a third argument to
Fnarrow_to_region.
* src/bytecode.c (exec_byte_code): Add a third argument to
Fnarrow_to_region.
* etc/NEWS (like): Mention the new parameter of 'narrow-to-region'.
* doc/lispref/positions.texi (Narrowing): Document it.
* lisp/emacs-lisp/icons.el (icons--create): Use 'display-images-p'
to test for image capability.
* doc/lispref/display.texi (Icons): Improve indexing,
cross-references, and wording.
The 'font-lock-support-mode' is occasionally useful for debugging
purposes, so it remains as a defvar.
Ref: https://lists.gnu.org/r/emacs-devel/2020-08/msg00125.html
* lisp/obsolete/fast-lock.el:
* lisp/obsolete/lazy-lock.el: Delete libraries obsolete since
22.1. (Bug#56560)
* lisp/font-lock.el (font-lock-support-mode): Make into a defvar and
delete any mention of 'lazy-lock-mode' and 'fast-lock-mode'.
(font-lock-turn-on-thing-lock, font-lock-turn-off-thing-lock):
Drop support for obsolete modes lazy-lock and fast-lock.
(font-lock-after-fontify-buffer)
(font-lock-after-unfontify-buffer): Make into obsolete function
aliases for 'ignore'. Adjust callers.
(font-lock-keywords, font-lock-inhibit-thing-lock): Adjust
documentation to not mention lazy-lock and fast-lock.
* lisp/font-core.el (font-lock-defaults): Adjust documentation to
not mention 'font-lock-inhibit-thing-lock'.
* lisp/mail/rmail.el (rmail-variables): Don't inhibit obsolete
lazy-lock-mode and fast-lock-mode.
