Merge from origin/emacs-27

92f080dda8 Tab-bar related finishing touches.
224e8d1464 Make call_process call signal_after_change.  This fixes bu...
d02f2a793e * lisp/simple.el: Minor fixes to commentary.
196c42b8bf Fix a few typos
4f2b967795 Fix doc strings for image-dired rotation commands

# Conflicts:
#	etc/NEWS

8 files changed, 64 insertions, 29 deletions

diff --git a/etc/NEWS.27 b/etc/NEWS.27
index 9c74c84f456..792851e5af5 100644
--- a/etc/NEWS.27
+++ b/etc/NEWS.27
@@ -38,7 +38,7 @@ HarfBuzz text shaping engine.  It is on by default; use './configure
 --without-harfbuzz' to build without it.  The HarfBuzz text shaping is
 available via new font backend drivers 'xfthb' and 'ftcrhb' for Xft
 and Cairo drawings, respectively, and via the 'harfbuzz' backend on
-MS-Windows.  The Harfbuzz text shaping is preferred to the previously
+MS-Windows.  The HarfBuzz text shaping is preferred to the previously
 supported ones, so the font backends that use older shaping engines
 (FLT on GNU and Unix systems and Uniscribe on MS-Windows) are not
 enabled by default; they can be enabled via the 'font-backend' frame
diff --git a/lisp/image-dired.el b/lisp/image-dired.el
index 7774b82d514..768e941490d 100644
--- a/lisp/image-dired.el
+++ b/lisp/image-dired.el
@@ -1980,20 +1980,12 @@ With prefix argument ARG, display image in its original size."
       (clear-image-cache thumb))))
 
 (defun image-dired-rotate-thumbnail-left ()
-  "Rotate thumbnail left (counter clockwise) 90 degrees.
-The result of the rotation is displayed in the image display area
-and a confirmation is needed before the original image files is
-overwritten.  This confirmation can be turned off using
-`image-dired-rotate-original-ask-before-overwrite'."
+  "Rotate thumbnail left (counter clockwise) 90 degrees."
   (interactive)
   (image-dired-rotate-thumbnail "270"))
 
 (defun image-dired-rotate-thumbnail-right ()
-  "Rotate thumbnail counter right (clockwise) 90 degrees.
-The result of the rotation is displayed in the image display area
-and a confirmation is needed before the original image files is
-overwritten.  This confirmation can be turned off using
-`image-dired-rotate-original-ask-before-overwrite'."
+  "Rotate thumbnail counter right (clockwise) 90 degrees."
   (interactive)
   (image-dired-rotate-thumbnail "90"))
 
@@ -2035,12 +2027,20 @@ overwritten.  This confirmation can be turned off using
           (image-dired-display-image file))))))
 
 (defun image-dired-rotate-original-left ()
-  "Rotate original image left (counter clockwise) 90 degrees."
+  "Rotate original image left (counter clockwise) 90 degrees.
+The result of the rotation is displayed in the image display area
+and a confirmation is needed before the original image files is
+overwritten.  This confirmation can be turned off using
+`image-dired-rotate-original-ask-before-overwrite'."
   (interactive)
   (image-dired-rotate-original "270"))
 
 (defun image-dired-rotate-original-right ()
-  "Rotate original image right (clockwise) 90 degrees."
+  "Rotate original image right (clockwise) 90 degrees.
+The result of the rotation is displayed in the image display area
+and a confirmation is needed before the original image files is
+overwritten.  This confirmation can be turned off using
+`image-dired-rotate-original-ask-before-overwrite'."
   (interactive)
   (image-dired-rotate-original "90"))
 
diff --git a/lisp/simple.el b/lisp/simple.el
index 9bfd58f7d61..8be27745b1c 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3507,10 +3507,9 @@ whose `car' is BUFFER."
         (let ((win   (car (get-buffer-window-list buf)))
               (pmax  (with-current-buffer buf (point-max))))
 
-          ;; The first time we run a command in a fresh created buffer
+          ;; The first time we run a command in a freshly created buffer
           ;; we have not saved positions yet; advance to `point-max', so that
-          ;; succesive commands knows the position where the new comman start.
-          ;; (unless (and pos (memq sym '(save-point beg-last-out)))
+          ;; successive commands know where to start.
           (unless (and pos (memq sym '(save-point beg-last-out end-last-out)))
             (setq pos pmax))
           ;; Set point in the window displaying buf, if any; otherwise
diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index f70fb6baeee..eccab268dc9 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -360,19 +360,19 @@ to `tab-bar-tab-name-truncated'."
   :group 'tab-bar
   :version "27.1")
 
-(defvar tab-bar-tab-name-truncated-ellipsis
+(defvar tab-bar-tab-name-ellipsis
   (if (char-displayable-p ?…) "…" "..."))
 
 (defun tab-bar-tab-name-truncated ()
   "Generate tab name from the buffer of the selected window.
 Truncate it to the length specified by `tab-bar-tab-name-truncated-max'.
-Append ellipsis `tab-bar-tab-name-truncated-ellipsis' in this case."
+Append ellipsis `tab-bar-tab-name-ellipsis' in this case."
   (let ((tab-name (buffer-name (window-buffer (minibuffer-selected-window)))))
     (if (< (length tab-name) tab-bar-tab-name-truncated-max)
         tab-name
       (propertize (truncate-string-to-width
                    tab-name tab-bar-tab-name-truncated-max nil nil
-                   tab-bar-tab-name-truncated-ellipsis)
+                   tab-bar-tab-name-ellipsis)
                   'help-echo tab-name))))
 
 
@@ -722,11 +722,14 @@ Interactively, ARG selects the ARGth different frame to move to."
 If `leftmost', create as the first tab.
 If `left', create to the left from the current tab.
 If `right', create to the right from the current tab.
-If `rightmost', create as the last tab."
+If `rightmost', create as the last tab.
+If the value is a function, it should return a number as a position
+on the tab bar specifying where to insert a new tab."
   :type '(choice (const :tag "First tab" leftmost)
                  (const :tag "To the left" left)
                  (const :tag "To the right" right)
-                 (const :tag "Last tab" rightmost))
+                 (const :tag "Last tab" rightmost)
+                 (function :tag "Function"))
   :group 'tab-bar
   :version "27.1")
 
@@ -773,7 +776,9 @@ After the tab is created, the hooks in
                           ('leftmost 0)
                           ('rightmost (length tabs))
                           ('left (1- (or from-index 1)))
-                          ('right (1+ (or from-index 0)))))))
+                          ('right (1+ (or from-index 0)))
+                          ((pred functionp)
+                           (funcall tab-bar-new-tab-to))))))
       (setq to-index (max 0 (min (or to-index 0) (length tabs))))
       (cl-pushnew to-tab (nthcdr to-index tabs))
 
diff --git a/lisp/tab-line.el b/lisp/tab-line.el
index ad4050fec59..149fe8289c4 100644
--- a/lisp/tab-line.el
+++ b/lisp/tab-line.el
@@ -709,7 +709,7 @@ from the tab line."
           (set-window-prev-buffers nil (assq-delete-all buffer (window-prev-buffers)))
           (set-window-next-buffers nil (delq buffer (window-next-buffers)))))
        ((functionp tab-line-close-tab-function)
-        (funcall tab-line-close-tab-function)))
+        (funcall tab-line-close-tab-function tab)))
       (force-mode-line-update))))
 
 
diff --git a/src/callproc.c b/src/callproc.c
index 52b89504205..6bd4ae22f63 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -746,6 +746,8 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int filefd,
       int carryover = 0;
       bool display_on_the_fly = display_p;
       struct coding_system saved_coding = process_coding;
+      ptrdiff_t prepared_pos = 0; /* prepare_to_modify_buffer was last
+                                     called here.  */
 
       while (1)
         {
@@ -773,6 +775,33 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int filefd,
               if (display_on_the_fly)
                 break;
             }
+          /* CHANGE FUNCTIONS
+             For each iteration of the enclosing while (1) loop which
+             yields data (i.e. nread > 0), before- and
+             after-change-functions are each invoked exactly once.
+             This is done directly from the current function only, by
+             calling prepare_to_modify_buffer and signal_after_change.
+             It is not done here by directing another function such as
+             insert_1_both to call them.  The call to
+             prepare_to_modify_buffer follows this comment, and there
+             is one call to signal_after_change in each of the
+             branches of the next `else if'.
+
+             Exceptionally, the insertion into the buffer is aborted
+             at the call to del_range_2 ~45 lines further down, this
+             function removing the newly inserted data.  At this stage
+             prepare_to_modify_buffer has been called, but
+             signal_after_change hasn't.  A continue statement
+             restarts the enclosing while (1) loop.  A second,
+             unwanted, call to `prepare_to_modify_buffer' is inhibited
+             by the test perpared_pos < PT.  The data are inserted
+             again, and this time signal_after_change gets called,
+             balancing the previous call to prepare_to_modify_buffer.  */
+          if ((prepared_pos < PT) && nread)
+            {
+              prepare_to_modify_buffer (PT, PT, NULL);
+              prepared_pos = PT;
+            }
 
           /* Now NREAD is the total amount of data in the buffer.  */
 
@@ -780,15 +809,16 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int filefd,
             ;
           else if (NILP (BVAR (current_buffer, enable_multibyte_characters))
                    && ! CODING_MAY_REQUIRE_DECODING (&process_coding))
-            insert_1_both (buf, nread, nread, 0, 1, 0);
+            {
+              insert_1_both (buf, nread, nread, 0, 0, 0);
+              signal_after_change (PT, 0, nread);
+            }
           else
             {                   /* We have to decode the input.  */
               Lisp_Object curbuf;
               ptrdiff_t count1 = SPECPDL_INDEX ();
 
               XSETBUFFER (curbuf, current_buffer);
-              /* FIXME: Call signal_after_change!  */
-              prepare_to_modify_buffer (PT, PT, NULL);
               /* We cannot allow after-change-functions be run
                  during decoding, because that might modify the
                  buffer, while we rely on process_coding.produced to
@@ -824,6 +854,7 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int filefd,
 
               TEMP_SET_PT_BOTH (PT + process_coding.produced_char,
                                 PT_BYTE + process_coding.produced);
+              signal_after_change (PT, 0, process_coding.produced_char);
               carryover = process_coding.carryover_bytes;
               if (carryover > 0)
                 memcpy (buf, process_coding.carryover,
diff --git a/src/dispnew.c b/src/dispnew.c
index d094ca61798..d79ae836c56 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -4361,7 +4361,7 @@ scrolling_window (struct window *w, int tab_line_p)
 
   /* Can't scroll the display of w32 GUI frames when position of point
      is indicated by the system caret, because scrolling the display
-     will then "copy" the pixles used by the caret.  */
+     will then "copy" the pixels used by the caret.  */
 #ifdef HAVE_NTGUI
   if (w32_use_visible_system_caret)
     return 0;
diff --git a/src/xdisp.c b/src/xdisp.c
index a5efbb39bed..68a504fb2d4 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -19193,7 +19193,7 @@ try_window_reusing_current_matrix (struct window *w)
 
   /* Can't scroll the display of w32 GUI frames when position of point
      is indicated by the system caret, because scrolling the display
-     will then "copy" the pixles used by the caret.  */
+     will then "copy" the pixels used by the caret.  */
 #ifdef HAVE_NTGUI
   if (w32_use_visible_system_caret)
     return false;
@@ -20185,7 +20185,7 @@ try_window_id (struct window *w)
 
   /* Can't let scroll_run_hook below run on w32 GUI frames when
      position of point is indicated by the system caret, because
-     scrolling the display will then "copy" the pixles used by the
+     scrolling the display will then "copy" the pixels used by the
      caret.  */
 #ifdef HAVE_NTGUI
   if (FRAME_W32_P (f) && w32_use_visible_system_caret)