Backport from master.
Problem reported by Ulrich Mueller; fix suggested by Eli Zaretskii
and Andreas Schwab (Bug#30855).
* src/alloc.c (mark_memory): Call mark_maybe_object only on
pointers that are properly aligned for Lisp_Object.
* doc/lispref/help.texi (Help Functions): Change variable name
to 'buffer-or-name'.
* lisp/help.el (with-help-window): Change variable name to
'buffer-or-name' and rewrite the doc string, adding reference
to 'help-window-setup'. (Bug#30792)
* doc/emacs/building.texi (Compilation Shell): Mention that this
section is for local compilation buffers.
(Compilation, Compilation Mode): Mention that 'g' is bound to
'recompile' in compilation buffers.
(Grep Searching): Add a cross-reference to "Compilation Mode".
Suggested by Michael Albinus <michael.albinus@gmx.de> in
emacs-manual-bugs@gnu.org.
* doc/emacs/building.texi (Compilation, Grep Searching)
(Debuggers, GUD Customization, Source Buffers)
(Breakpoints Buffer, Threads Buffer): Minor fixes and updates.
Suggested by Michael Albinus <michael.albinus@gmx.de> in
emacs-manual-bugs@gnu.org.
* doc/emacs/macos.texi (Mac / GNUstep Basics): Fix typos. Improve
indexing.
(Mac / GNUstep Basics, Mac / GNUstep Customization)
(Mac / GNUstep Events): Improve indexing.
* doc/emacs/rmail.texi (Rmail): Mention Gnus.
(Rmail Basics, Rmail Scrolling): Improve cross-references and
indexing.
(Rmail Motion): Minor improvements.
(Rmail Inbox): Remove outdated text about Babyl format.
(Rmail Files): Formatting changes. Comment out
set-rmail-inbox-list in the table of commands, as it is commented
out in the text that follows.
(Rmail Output, Rmail Labels, Rmail Reply, Rmail Make Summary):
Minor copyedits.
(Rmail Summary Edit): Document
rmail-summary-scroll-between-messages.
(Rmail Editing): Improve indexing.
(Movemail): Fix typos.
(Remote Mailboxes): Use "POP3" rather than "POP".
* doc/lispref/positions.texi (Word Motion): Fix reference to
`char-script-table'.
* lisp/simple.el (backward-word):
* src/syntax.c (forward-word): Mention `char-script-table' and add
link to the 'Word Motion' manual section.
* doc/emacs/mule.texi (Recognize Coding, Fontsets): Minor changes
in wording. Suggested by Richard Stallman <rms@gnu.org> in
emacs-manual-bugs@gnu.org.
* doc/emacs/mule.texi (International, Coding Systems)
(Bidirectional Editing): Minor wording changes and typo fixes.
Suggested by Michael Albinus <michael.albinus@gmx.de> in
emacs-manual-bugs@gnu.org.
* src/xdisp.c (Fmove_point_visually): Don't let point exceed the
BEGV..ZV range. Signal Beginning of buffer error when there's a
before-string at BEGV. (Bug#30787)
* doc/lispref/display.texi (ImageMagick Images): Remove an
outdated comment that references a fixed bug.
(SVG Images): Fix grammar, and call functions functions (there are
no commands in lisp/svg.el).
* doc/emacs/display.texi (Useless Whitespace): Don't upcase "TAB"
and "SPC" when alluding to characters. Suggested by Richard
Stallman <rms@gnu.org>.
* doc/emacs/buffers.texi (Misc Buffer): Clarify what "read-only"
means for buffers.
(Buffers): Define and describe "buffer contents". Suggested by
Richard Stallman <rms@gnu.org>. (Bug#30685)
* doc/lispref/variables.texi (Local Variables): Make more clear
that local bindings of 'let' are in effect only within the body.
Suggested by Marcin Borkowski <mbork@mbork.pl>, see
http://lists.gnu.org/archive/html/emacs-devel/2018-03/msg00217.html
for the details.
* doc/emacs/programs.texi (Matching): Fix a typo. Reported by
Alex Branham <alex.branham@gmail.com> in emacs-manual-bugs@gnu.org.
Improve indexing.
* doc/emacs/display.texi (Highlight Interactively)
(Useless Whitespace, Line Truncation, Visual Line Mode): Minor
changes of wording and typo corrections. Suggested by Michael
Albinus <michael.albinus@gmx.de> in emacs-manual-bugs@gnu.org.
* lisp/gnus/spam.el (spam-ifile-path, spam-ifile-database-path)
(spam-bogofilter-path, spam-bsfilter-path)
(spam-spamassassin-path, spam-sa-learn-path):
Remove variables that are described as obsolete, but are
really completely unused, and have been for years.
