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customize-variable if the variable can be customized.

(describe-bindings): Likewise.
(help-xref-go-back): New arg BUFFER.
(help-make-xrefs): Specify the help buffer as arg for
help-xref-go-back.

name, if available.

(describe-function): Use describe-function-1.
(describe-key): Likewise.

(help-with-tutorial): Get a tutorial file name by
get-language-info instead of help-with-tutorial-alist.

expansions.
(help-xref-button): Simplify.
(help-make-xrefs): Set overriding keymap properly.

(help-mode-maybe): Ensure read-only.
(help-xref-button): Obey help-highlight-p.
(help-follow): Remove check for args being a list.
(help-mode): Doc fix.
(help-highlight-p): Put in help group.

(help-make-xrefs): Insert button label in scope of
inhibit-read-only binding.
(help-mode-map, help-make-xrefs): Define TAB, RET correctly.

Make hyperlinks for cross-reference info intuited from *Help* buffer.
(help-font-lock-keywords): Removed.
(help-mode-map): Define keys for navigating hyperlinks.
(help-xref-stack, help-xref-stack-item): New permanent-local variables.
(help-mode): Set font-lock-defaults to nil.
(help-mode-maybe): Invoke help-make-xrefs in Help mode.
(help-setup-xref): New function.
(describe-key, describe-mode, describe-function,
describe-variable): Call it.
(view-lossage, describe-bindings): Nullify help-xref-stack,
help-xref-stack-item.
(help-highlight-p): New option.
(help-highlight-face): New variable.
(help-back-label, help-xref-symbol-regexp, help-xref-info-regexp):
New variables.
(help-setup-xref, help-make-xrefs, help-xref-button,
help-xref-interned, help-xref-mode, help-follow-mouse,
help-xref-go-back, help-go-back, help-follow, help-next-ref): New functions.

(help-return-method): New variable.
(print-help-return-message): Set help-return-method.

(help-with-tutorial): Use help-with-tutorial-alist to read a language
name, and also to find the tutorial file for a language.

for compressed files.

Reject any "function call" with whitespace after the open-paren.

(describe-function): Likewise.

(describe-key, describe-mode): Don't call help-mode here.
(view-lossage, describe-function, describe-variable): Likewise.

insert help text into current buffer.

tutorial file.

language interactively.

Put doc string first, if the value is long.