Merge from origin/emacs-26

bc8dc37 (origin/emacs-26) Minor copyedits in "Distribution" chapter o...
1c7a936 Minor copyedits in "Entering" chapter of Emacs manual.
1d4498b Minor wording change in the Emacs manual
2bf49e7 Fix a typo in the Emacs manual
f3546a2 Improve the "Basic" chapter of the Emacs manual
691431e Resurrect lost text in lispref
956807b * lisp/emacs-lisp/rx.el (rx): Fix the definition of 'blank'.
7d90d2e Proofread os.texi and files.texi
490c736 Minor improvements in the "International" chapter of Emacs ma...
79252d3 Minor improvement in "Text" chapter of Emacs manual

1 files changed, 7 insertions, 4 deletions

diff --git a/lisp/emacs-lisp/rx.el b/lisp/emacs-lisp/rx.el
index 37aa25b556d..c4f6d4f70ea 100644
--- a/lisp/emacs-lisp/rx.el
+++ b/lisp/emacs-lisp/rx.el
@@ -57,7 +57,6 @@
 ;; (rx (and line-start (0+ (in "a-z"))))
 ;;
 ;; "\n[^ \t]"
-;; (rx (and "\n" (not blank))), or
 ;; (rx (and "\n" (not (any " \t"))))
 ;;
 ;; "\\*\\*\\* EOOH \\*\\*\\*\n"
@@ -74,9 +73,9 @@
 ;; "^content-transfer-encoding:\\(\n?[\t ]\\)*quoted-printable\\(\n?[\t ]\\)*"
 ;; (rx (and line-start
 ;;          "content-transfer-encoding:"
-;;          (+ (? ?\n)) blank
+;;          (+ (? ?\n)) (any " \t")
 ;;          "quoted-printable"
-;;          (+ (? ?\n)) blank))
+;;          (+ (? ?\n)) (any " \t"))
 ;;
 ;; (concat "^\\(?:" something-else "\\)")
 ;; (rx (and line-start (eval something-else))), statically or
@@ -962,7 +961,11 @@ CHAR
      matches 0 through 9, a through f and A through F.
 
 `blank'
-     matches space and tab only.
+     matches horizontal whitespace, as defined by Annex C of the
+     Unicode Technical Standard #18.  In particular, it matches
+     spaces, tabs, and other characters whose Unicode
+     `general-category' property indicates they are spacing
+     separators.
 
 `graphic', `graph'
      matches graphic characters--everything except whitespace, ASCII