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is nil, don't check the `font-lock-multiline' text property.

matches a multi-line font-lock pattern, make sure the whole text
will be redisplayed.

(jit-lock-functions): Make buffer-local.
(jit-lock-saved-fontify-buffer-function): Remove.
(jit-lock-mode): Remove autoload cookie.
Remove font-lock specific code.
(jit-lock-unregister): Don't bother handling complex hooks any more.
(jit-lock-refontify): New function.
(jit-lock-fontify-buffer): Use it.
(jit-lock-function-1): Replaced by jit-lock-fontify-now.
(jit-lock-fontify-now): Renamed from jit-lock-function-1.
Add optional args START and END.
Never call font-lock-fontify-region directly.
(jit-lock-function, jit-lock-stealth-fontify): Use it.

consistently with its docstring.
Set jit-lock-first-unfontify-pos in an idempotent way.
(jit-lock-register): Autoload and add arg CONTEXTUAL.

(jit-lock-mode): Make sure font-lock-keywords-only is bound before use.
(jit-lock-functions): New var.
(jit-lock-function-1): Use it if non-nil.
Don't switch the syntax-table.  Don't set parse-sexp-lookup-properties.
Set the `fontified' property before doing the fontification to avoid
repeatedly going through the same error.
Don't turn errors into messages.

Renamed from with-buffer-prepared-for-font-lock and use
inhibit-modification-hooks rather than setting *-change-functions.
Update all functions to use the new name.
(jit-lock-first-unfontify-pos): New semantics (and doc).
(jit-lock-mode): Make non-interactive.
Don't automatically turn on font-lock.
Set jit-lock-first-unfontify-pos to indicate deferred-contextual mode.
Always use jit-lock-after-change.
Remove and restore font-lock-after-change-function.
(turn-on-jit-lock, jit-lock-after-fontify-buffer)
(jit-lock-after-unfontify-buffer): Remove.
(jit-lock-stealth-fontify):
Reset jit-lock-first-unfontify-pos to point-max rather than to nil.
(jit-lock-after-change): Set the `fontified' text-prop to nil.

Use consistent make-local-variable style for font-lock-fontified.
(jit-lock-fontify-buffer):
Don't bother checking for font-lock-mode and jit-lock-mode.

(jit-lock-fontify-buffer): New function for JIT refontification.
(jit-lock-mode): Fix docstring.
Use jit-lock-fontify-buffer for font-lock-fontify-buffer-function.
Remove jit-lock-after-change from the _local_ hook.
(jit-lock-function-1): Fix docstring.

at the wrong place.

restore-buffer-modified-p.
(with-buffer-prepared-for-font-lock): Use with-buffer-unmodified.
(jit-lock-function, jit-lock-stealth-fontify): Don't use
with-buffer-unmodified.

(with-buffer-prepared-for-font-lock): Don't preserve buffer's
modified state.
(jit-lock-function-1): Extracted from jit-lock-function; not
preserving buffer's modified state.
(jit-lock-function, jit-lock-stealth-fontify): Call
jit-lock-function-1.

about behavior of set-buffer-modified-p wrt redisplay.

position.
(jit-lock-stealth-chunk-start): Rewritten.

to the beginning of the line containing the range start and
the beginning of the line following the range end.

Don't unwind-protect font-lock-fontify-region.