Merge from origin/emacs-26

0860ac0 (origin/emacs-26) Improve documentation of features that use ...
fae1ff6 Fix docstrings in pong
82a2894 Improve doc strings of 'append-to-buffer' and friends
cb0403d Fix octave-mode ElDoc support
691790b Avoid Groff hanging on MS-Windows when invoked by "M-x man"

doc/emacs/display.texi

@@ -1116,7 +1116,8 @@ the arrows scrolls the display horizontally in the direction of the
 arrow.
 
   The fringes can also indicate other things, such as buffer
-boundaries (@pxref{Displaying Boundaries}), and where a program you
+boundaries (@pxref{Displaying Boundaries}), unused lines near the end
+of the window (@pxref{indicate-empty-lines}), and where a program you
 are debugging is executing (@pxref{Debuggers}).
 
 @vindex overflow-newline-into-fringe
@@ -1258,6 +1259,7 @@ extra spaces at the end of each line in the region.
 @vindex indicate-empty-lines
 @cindex unused lines
 @cindex fringes, and unused line indication
+@anchor{indicate-empty-lines}
   On graphical displays, Emacs can indicate unused lines at the end of
 the window with a small image in the left fringe (@pxref{Fringes}).
 The image appears for screen lines that do not correspond to any

lisp/man.el

@@ -624,7 +624,13 @@ This is necessary if one wants to dump man.el with Emacs."
                           ;; so we don't need `2>' even with DOS shells
                           ;; which do support stderr redirection.
                           ((not (fboundp 'make-process)) " %s")
-                          ((concat " %s 2>" null-device)))))
+                          ((concat " %s 2>" null-device
+                                   ;; Some MS-Windows ports of Groff
+                                   ;; try to read stdin after exhausting
+                                   ;; the command-line arguments; make
+                                   ;; them exit if/when they do.
+                                   (if (eq system-type 'windows-nt)
+                                       (concat " <" null-device)))))))
 	(flist Man-filter-list))
     (while (and flist (car flist))
       (let ((pcom (car (car flist)))

lisp/play/pong.el

@@ -262,7 +262,7 @@
 
 
 (defun pong-move-left ()
-  "Move bat 2 up.
+  "Move bat 1 up.
 This is called left for historical reasons, since in some pong
 implementations you move with left/right paddle."
   (interactive)
@@ -274,7 +274,7 @@ implementations you move with left/right paddle."
 
 
 (defun pong-move-right ()
-  "Move bat 2 up."
+  "Move bat 1 down."
   (interactive)
   (if (< (+ pong-bat-player1 pong-bat-width) (1- pong-height))
       (and

lisp/progmodes/octave.el

@@ -1616,8 +1616,23 @@ code line."
      (list (format "print_usage ('%s');\n" fn)))
     (let (result)
       (dolist (line inferior-octave-output-list)
+        ;; The help output has changed a few times in GNU Octave.
+        ;; Earlier versions output "usage: " before the function signature.
+        ;; After deprecating the usage function, and up until GNU Octave 4.0.3,
+        ;; the output looks like this:
+        ;; -- Mapping Function: abs (Z).
+        ;; After GNU Octave 4.2.0, the output is less verbose and it looks like
+        ;; this:
+        ;; -- abs (Z)
+        ;; The following regexp matches these three formats.
+        ;; The "usage: " alternative matches the symbol, because a call to
+        ;; print_usage with a non-existent function (e.g., print_usage ('A'))
+        ;; would output:
+        ;; error: print_usage: 'A' not found
+        ;; and we wouldn't like to match anything in this case.
+        ;; See bug #36459.
         (when (string-match
-               "\\s-*\\(?:--[^:]+\\|usage\\):\\s-*\\(.*\\)$"
+               "\\s-*\\(?:--[^:]+:\\|\\_<usage:\\|--\\)\\s-*\\(.*\\)$"
                line)
           (push (match-string 1 line) result)))
       (setq octave-eldoc-cache

lisp/simple.el

@@ -5356,8 +5356,10 @@ BUFFER may be a buffer or a buffer name."
   nil)
 
 (defun append-to-buffer (buffer start end)
-  "Append to specified buffer the text of the region.
-It is inserted into that buffer before its point.
+  "Append to specified BUFFER the text of the region.
+The text is inserted into that buffer before its point.
+BUFFER can be a buffer or the name of a buffer; this
+function will create BUFFER if it doesn't already exist.
 
 When calling from a program, give three arguments:
 BUFFER (or buffer name), START and END.
@@ -5379,8 +5381,10 @@ START and END specify the portion of the current buffer to be copied."
             (set-window-point window (point))))))))
 
 (defun prepend-to-buffer (buffer start end)
-  "Prepend to specified buffer the text of the region.
-It is inserted into that buffer after its point.
+  "Prepend to specified BUFFER the text of the region.
+The text is inserted into that buffer after its point.
+BUFFER can be a buffer or the name of a buffer; this
+function will create BUFFER if it doesn't already exist.
 
 When calling from a program, give three arguments:
 BUFFER (or buffer name), START and END.
@@ -5393,8 +5397,10 @@ START and END specify the portion of the current buffer to be copied."
 	(insert-buffer-substring oldbuf start end)))))
 
 (defun copy-to-buffer (buffer start end)
-  "Copy to specified buffer the text of the region.
-It is inserted into that buffer, replacing existing text there.
+  "Copy to specified BUFFER the text of the region.
+The text is inserted into that buffer, replacing existing text there.
+BUFFER can be a buffer or the name of a buffer; this
+function will create BUFFER if it doesn't already exist.
 
 When calling from a program, give three arguments:
 BUFFER (or buffer name), START and END.