Merge from origin/emacs-26

af1624f * lisp/net/shr.el (shr-browse-url): Doc fix.  (Bug#30957)
3a451bd ; * doc/emacs/msdos.texi: Fix wording of last change.
3bc1e2f Mention `key-description' as inverse of `kbd' (Bug#30942)
e50196e Document return value of pcase (Bug#30425)
8a2466f * doc/emacs/macos.texi: Tweak grammar and capitalization.
9db62bf Distinguish free from non-free OSes
ff49d86 * doc/emacs/misc.texi (Amusements): Avoid non-printing charac...
5bab671 Fix xrefs in pdf Emacs manual

6 files changed, 47 insertions, 6 deletions

diff --git a/doc/emacs/fortran-xtra.texi b/doc/emacs/fortran-xtra.texi
index 859c6132436..fa5a3e6eafb 100644
--- a/doc/emacs/fortran-xtra.texi
+++ b/doc/emacs/fortran-xtra.texi
@@ -208,7 +208,13 @@ line is a continuation of the previous line.  We call this @dfn{fixed
 form}.  (In GNU Emacs we always count columns from 0; but note that
 the Fortran standard counts from 1.  You can customize the variable
 @code{column-number-indicator-zero-based} to make the column display
-Fortran-like; @pxref{Optional Mode Line}.)  The variable
+@iftex
+Fortran-like; @pxref{Optional Mode Line,,, emacs, the Emacs Manual}.)
+@end iftex
+@ifnottex
+Fortran-like; @pxref{Optional Mode Line}.)
+@end ifnottex
+The variable
 @code{fortran-continuation-string} specifies what character to put in
 column 5.  A line that starts with a tab character followed by any digit
 except @samp{0} is also a continuation line.  We call this style of
@@ -254,7 +260,13 @@ column 8 must consist of one tab character.
 indentation assumes it is a line number and moves it to columns 0
 through 4.  (Columns always count from 0 in Emacs, but setting
 @code{column-number-indicator-zero-based} to @code{nil} can change
-that, @pxref{Optional Mode Line}.)
+that,
+@iftex
+@pxref{Optional Mode Line,,, emacs, the Emacs Manual}.)
+@end iftex
+@ifnottex
+@pxref{Optional Mode Line}.)
+@end ifnottex
 
 @vindex fortran-line-number-indent
   Line numbers of four digits or less are normally indented one space.
@@ -535,7 +547,13 @@ statement body.  Column numbers appear above them.
 
   Note that the column numbers count from zero, as always in GNU Emacs
 (but customizing @code{column-number-indicator-zero-based} can change
-column display to match that of Fortran; @pxref{Optional Mode Line}).
+column display to match that of Fortran;
+@iftex
+@pxref{Optional Mode Line,,, emacs, the Emacs Manual}.)
+@end iftex
+@ifnottex
+@pxref{Optional Mode Line}.)
+@end ifnottex
 As a result, the numbers may be one less than those you are familiar
 with; but the positions they indicate in the line are standard for
 Fortran.
diff --git a/doc/emacs/macos.texi b/doc/emacs/macos.texi
index e669eaa4cbd..ef2e9448902 100644
--- a/doc/emacs/macos.texi
+++ b/doc/emacs/macos.texi
@@ -14,6 +14,14 @@ built either without window system support, with X11, or with the
 Cocoa interface; this section only applies to the Cocoa build.  This
 does not support versions before macOS 10.6.
 
+  GNUstep is free software; macOS is not.  Because it is a non-free
+operating system, macOS denies its users the freedom that every computer
+user deserves.  That is an injustice.  For your freedom's sake, we
+urge you to switch to a free operating system.
+
+  We support GNU Emacs on proprietary operating systems because
+we hope this taste of freedom will inspire users to escape from them.
+
   For various historical and technical reasons, Emacs uses the term
 @samp{Nextstep} internally, instead of ``Cocoa'' or ``macOS''; for
 instance, most of the commands and variables described in this section
diff --git a/doc/emacs/misc.texi b/doc/emacs/misc.texi
index 23495992fcc..a4bfba3e98d 100644
--- a/doc/emacs/misc.texi
+++ b/doc/emacs/misc.texi
@@ -3011,7 +3011,7 @@ is idle.
 
 @findex butterfly
 @cindex butterfly
-  Real Programmers™ deploy @kbd{M-x butterfly}, which uses butterflies
+  ``Real Programmers'' deploy @kbd{M-x butterfly}, which uses butterflies
 to flip a bit on the drive platter, see @uref{https://xkcd.com/378}.
 
 @findex doctor
diff --git a/doc/emacs/msdos.texi b/doc/emacs/msdos.texi
index 90f0389a0e0..9353f4b6e84 100644
--- a/doc/emacs/msdos.texi
+++ b/doc/emacs/msdos.texi
@@ -19,6 +19,13 @@ manual (@pxref{MS-DOS,,, emacs-xtra, Specialized Emacs Features}).
 section (@pxref{MS-DOS}).
 @end ifnottex
 
+  MS-Windows is a non-free operating system; that means it denies its
+users the freedom that every computer user deserves.  That is an
+injustice.  For your freedom's sake, we urge you to switch to a free
+operating system.
+
+  We support GNU Emacs on proprietary operating systems because we
+hope this taste of freedom will inspire users to escape from them.
 
   The behavior of Emacs on MS-Windows is reasonably similar to what is
 documented in the rest of the manual, including support for long file
diff --git a/doc/emacs/picture-xtra.texi b/doc/emacs/picture-xtra.texi
index 288a6e89aa9..9ebc78ec628 100644
--- a/doc/emacs/picture-xtra.texi
+++ b/doc/emacs/picture-xtra.texi
@@ -262,7 +262,14 @@ Clear out the region-rectangle with spaces
 text.
 @item C-c C-w @var{r}
 Similar, but save rectangle contents in register @var{r} first
-(@code{picture-clear-rectangle-to-register}).  @xref{Registers}.
+(@code{picture-clear-rectangle-to-register}).
+@iftex
+@xref{Registers,,, emacs, the Emacs Manual}.
+@end iftex
+@ifnottex
+@xref{Registers}.
+@end ifnottex
+
 @item C-c C-y
 Copy last killed rectangle into the buffer by overwriting, with upper
 left corner at point (@code{picture-yank-rectangle}).  With argument,
diff --git a/doc/lispref/control.texi b/doc/lispref/control.texi
index f85ee947790..adec632da6a 100644
--- a/doc/lispref/control.texi
+++ b/doc/lispref/control.texi
@@ -317,7 +317,8 @@ list of the form @code{(@var{pattern} @var{body-forms}@dots{})}.
 @var{pattern} of each clause, in textual order.  If the value matches,
 the clause succeeds; @code{pcase} then evaluates its @var{body-forms},
 and returns the value of the last of @var{body-forms}.  Any remaining
-@var{clauses} are ignored.
+@var{clauses} are ignored.  If no clauses match, then the @code{pcase}
+form evaluates to @code{nil}.
 
 The @var{pattern} part of a clause can be of one of two types:
 @dfn{QPattern}, a pattern quoted with a backquote; or a