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master 6a17bb4: Merge from origin/emacs-28

From: Stefan Kangas
Subject: master 6a17bb4: Merge from origin/emacs-28
Date: Fri, 24 Dec 2021 00:50:46 -0500 (EST)

branch: master
commit 6a17bb48798bf88458d43e7417e64d2efd74494b
Merge: fbe026c 04be23f
Author: Stefan Kangas <stefan@marxist.se>
Commit: Stefan Kangas <stefan@marxist.se>

    Merge from origin/emacs-28
    04be23f19f Improve Xref documentation
    edb1d491d9 * lisp/net/shr.el (shr-expand-url): Also strip trailing wh...
 lisp/net/shr.el        |  4 +++-
 lisp/progmodes/xref.el | 16 ++++++++++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/lisp/net/shr.el b/lisp/net/shr.el
index 44fb5ec..bd16a77 100644
--- a/lisp/net/shr.el
+++ b/lisp/net/shr.el
@@ -857,9 +857,11 @@ size, and full-buffer size."
   (when (zerop (length url))
     (setq url nil))
-  ;; Strip leading whitespace
+  ;; Strip leading/trailing whitespace
   (and url (string-match "\\`\\s-+" url)
        (setq url (substring url (match-end 0))))
+  (and url (string-match "\\s-+\\'" url)
+       (setq url (substring url 0 (match-beginning 0))))
   (cond ((zerop (length url))
          (nth 3 base))
         ((or (not base)
diff --git a/lisp/progmodes/xref.el b/lisp/progmodes/xref.el
index ca3594d..c1981cc 100644
--- a/lisp/progmodes/xref.el
+++ b/lisp/progmodes/xref.el
@@ -44,7 +44,7 @@
 ;; The last three methods operate with "xref" and "location" values.
-;; One would usually call `make-xref' and `xref-make-file-location',
+;; One would usually call `xref-make' and `xref-make-file-location',
 ;; `xref-make-buffer-location' or `xref-make-bogus-location' to create
 ;; them.  More generally, a location must be an instance of a type for
 ;; which methods `xref-location-group' and `xref-location-marker' are
@@ -206,7 +206,19 @@ is not known."
                   (:constructor xref-make (summary location))
                   (:noinline t))
   "An xref item describes a reference to a location somewhere."
-  summary location)
+  (summary nil :documentation "String which describes the location.
+When `xref-location-line' returns non-nil (a number), the summary
+is implied to be the contents of a file or buffer line containing
+the location.  When multiple locations in a row report the same
+line, in the same group (corresponding to the case of multiple
+locations on one line), the summaries are concatenated in the
+Xref output buffer.  Consequently, any code that creates xref
+values should take care to slice the summary values when several
+locations point to the same line.
+This behavior is new in Emacs 28.")
+  location)
 (xref--defstruct (xref-match-item
                   (:include xref-item)

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