Revert commit 38b3780f6e.

5 files changed, 30 insertions, 164 deletions

diff --git a/src/buffer.c b/src/buffer.c
index d5b4292a21d..509ce51b55e 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5276,9 +5276,6 @@ init_buffer_once (void)
   XSETFASTINT (BVAR (&buffer_local_flags, tab_line_format), idx); ++idx;
   XSETFASTINT (BVAR (&buffer_local_flags, cursor_type), idx); ++idx;
   XSETFASTINT (BVAR (&buffer_local_flags, extra_line_spacing), idx); ++idx;
-  XSETFASTINT (BVAR (&buffer_local_flags, auto_narrow__narrowing_state), idx);
-  /* Make this one a permanent local.  */
-  buffer_permanent_local_flags[idx++] = 1;
   XSETFASTINT (BVAR (&buffer_local_flags, cursor_in_non_selected_windows), idx); ++idx;
 
   /* buffer_local_flags contains no pointers, so it's safe to treat it
@@ -5665,7 +5662,7 @@ A string is printed verbatim in the mode line except for %-constructs:
   %p -- print percent of buffer above top of window, or Top, Bot or All.
   %P -- print percent of buffer above bottom of window, perhaps plus Top,
         or print Bottom or All.
-  %n -- print Narrow or Auto-Narrow if appropriate.
+  %n -- print Narrow if appropriate.
   %t -- visited file is text or binary (if OS supports this distinction).
   %z -- print mnemonics of keyboard, terminal, and buffer coding systems.
   %Z -- like %z, but including the end-of-line format.
@@ -6366,10 +6363,6 @@ see `display-graphic-p'.
 If value is a floating point number, it specifies the spacing relative
 to the default frame line height.  A value of nil means add no extra space.  */);
 
-  DEFVAR_PER_BUFFER ("auto-narrow--narrowing-state",
-		     &BVAR (current_buffer, auto_narrow__narrowing_state), Qnil,
-		     doc: /* Internal variable used by `auto-narrow-mode'.  */);
-
   DEFVAR_PER_BUFFER ("cursor-in-non-selected-windows",
 		     &BVAR (current_buffer, cursor_in_non_selected_windows), Qnil,
 		     doc: /* Non-nil means show a cursor in non-selected windows.
diff --git a/src/buffer.h b/src/buffer.h
index 19faa844e02..135eaf72d30 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -561,9 +561,6 @@ struct buffer
      in the display of this buffer.  */
   Lisp_Object extra_line_spacing_;
 
-  /* Narrowing state when auto-narrow mode is in effect.  */
-  Lisp_Object auto_narrow__narrowing_state_;
-
   /* Cursor type to display in non-selected windows.
      t means to use hollow box cursor.
      See `cursor-type' for other values.  */
@@ -835,11 +832,6 @@ bset_width_table (struct buffer *b, Lisp_Object val)
 {
   b->width_table_ = val;
 }
-INLINE void
-bset_auto_narrow__narrowing_state (struct buffer *b, Lisp_Object val)
-{
-  b->auto_narrow__narrowing_state_ = val;
-}
 
 /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return
    the max (resp. min) p such that
@@ -1120,12 +1112,6 @@ BUFFER_CHECK_INDIRECTION (struct buffer *b)
     }
 }
 
-INLINE bool
-BUFFER_AUTO_NARROWED_P (struct buffer *b)
-{
-  return EQ (BVAR (b, auto_narrow__narrowing_state), Qauto);
-}
-
 /* This structure holds the default values of the buffer-local variables
    that have special slots in each buffer.
    The default value occupies the same slot in this structure
diff --git a/src/fileio.c b/src/fileio.c
index bb6f73fe39a..10d4b8bc15e 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -4997,16 +4997,6 @@ by calling `format-decode', which see.  */)
 	   Otherwise start with an empty undo_list.  */
 	bset_undo_list (current_buffer, EQ (old_undo, Qt) ? Qt : Qnil);
 
-      if (!noninteractive
-	  && !NILP (Vauto_narrow_long_line_threshold)
-	  && !NILP (CALLN
-		    (Fgtr,
-		     Fcar (Fcdr (Fbuffer_line_statistics (Fcurrent_buffer ()))),
-		     Vauto_narrow_long_line_threshold)))
-	{
-	  bset_auto_narrow__narrowing_state (current_buffer, Qneeded);
-	}
-
       unbind_to (count1, Qnil);
     }
 
@@ -6648,17 +6638,6 @@ This includes interactive calls to `delete-file' and
   /* Lisp function for recursively deleting directories.  */
   DEFSYM (Qdelete_directory, "delete-directory");
 
-  DEFVAR_LISP ("auto-narrow-long-line-threshold",
-	       Vauto_narrow_long_line_threshold,
-	       doc: /* Line length above which `auto-narrow-mode' is entered.
-When non-nil, and when a file with one or more lines longer than
-`auto-narrow-long-line-threshold' is opened or inserted in a buffer,
-`auto-narrow-mode' is automatically enabled.
-When nil, `auto-narrow-mode' is disabled.  */);
-  Vauto_narrow_long_line_threshold = Qnil;
-
-  DEFSYM (Qauto_narrow_mode, "auto-narrow-mode");
-
   DEFSYM (Qsubstitute_env_in_file_name, "substitute-env-in-file-name");
   DEFSYM (Qget_buffer_window_list, "get-buffer-window-list");
 
diff --git a/src/keyboard.c b/src/keyboard.c
index 38aa64774dc..bed8307b6f2 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -1290,9 +1290,6 @@ command_loop_1 (void)
 
   if (NILP (Vmemory_full))
     {
-      if (!NILP (Vauto_narrow_post_command_function) && !NILP (Vrun_hooks))
-	safe_run_hooks (Qauto_narrow_post_command_function);
-
       /* Make sure this hook runs after commands that get errors and
 	 throw to top level.  */
       /* Note that the value cell will never directly contain nil
@@ -1475,8 +1472,6 @@ command_loop_1 (void)
       Vreal_this_command = cmd;
       safe_run_hooks (Qpre_command_hook);
 
-      safe_run_hooks (Qauto_narrow_pre_command_function);
-
       already_adjusted = 0;
 
       if (NILP (Vthis_command))
@@ -1527,8 +1522,6 @@ command_loop_1 (void)
           }
       kset_last_prefix_arg (current_kboard, Vcurrent_prefix_arg);
 
-      safe_run_hooks (Qauto_narrow_post_command_function);
-
       safe_run_hooks (Qpost_command_hook);
 
       /* If displaying a message, resize the echo area window to fit
@@ -12047,11 +12040,6 @@ syms_of_keyboard (void)
   DEFSYM (Qpre_command_hook, "pre-command-hook");
   DEFSYM (Qpost_command_hook, "post-command-hook");
 
-  DEFSYM (Qauto_narrow_pre_command_function,
-	  "auto-narrow-pre-command-function");
-  DEFSYM (Qauto_narrow_post_command_function,
-	  "auto-narrow-post-command-function");
-
   DEFSYM (Qundo_auto__add_boundary, "undo-auto--add-boundary");
   DEFSYM (Qundo_auto__undoably_changed_buffers,
           "undo-auto--undoably-changed-buffers");
@@ -12616,22 +12604,6 @@ avoid making Emacs unresponsive while the user types.
 See also `pre-command-hook'.  */);
   Vpost_command_hook = Qnil;
 
-  DEFVAR_LISP ("auto-narrow-pre-command-function",
-	       Vauto_narrow_pre_command_function,
-	       doc: /* Function executed before each command is executed in `auto-narrow-mode'.
-If non-nil, and `auto-narrow-mode' is enabled, the function is
-called before each command is executed, after `pre-command-hook'.
-It is called without arguments.  */);
-  Vauto_narrow_pre_command_function = Qnil;
-
-  DEFVAR_LISP ("auto-narrow-post-command-function",
-	       Vauto_narrow_post_command_function,
-	       doc: /* Function executed after each command is executed in `auto-narrow-mode'.
-If non-nil, and `auto-narrow-mode' is enabled, the function is
-called after each command is executed, before `post-command-hook'.
-It is called without arguments.  */);
-  Vauto_narrow_post_command_function = Qnil;
-
 #if 0
   DEFVAR_LISP ("echo-area-clear-hook", ...,
 	       doc: /* Normal hook run when clearing the echo area.  */);
diff --git a/src/xdisp.c b/src/xdisp.c
index be51a0eb136..4089525e10f 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -18872,20 +18872,11 @@ set_vertical_scroll_bar (struct window *w)
 	  && NILP (echo_area_buffer[0])))
     {
       struct buffer *buf = XBUFFER (w->contents);
-      if (! BUFFER_AUTO_NARROWED_P (current_buffer))
-	{
-	  whole = BUF_ZV (buf) - BUF_BEGV (buf);
-	  start = marker_position (w->start) - BUF_BEGV (buf);
-	  /* I don't think this is guaranteed to be right.  For the
-	     moment, we'll pretend it is.  */
-	  end = BUF_Z (buf) - w->window_end_pos - BUF_BEGV (buf);
-	}
-      else
-	{
-	  whole = BUF_Z (buf) - BUF_BEG (buf);
-	  start = marker_position (w->start) - BUF_BEG (buf);
-	  end = BUF_Z (buf) - w->window_end_pos - BUF_BEG (buf);
-	}
+      whole = BUF_ZV (buf) - BUF_BEGV (buf);
+      start = marker_position (w->start) - BUF_BEGV (buf);
+      /* I don't think this is guaranteed to be right.  For the
+	 moment, we'll pretend it is.  */
+      end = BUF_Z (buf) - w->window_end_pos - BUF_BEGV (buf);
 
       if (end < start)
 	end = start;
@@ -19142,14 +19133,6 @@ redisplay_window (Lisp_Object window, bool just_this_one_p)
      variables.  */
   set_buffer_internal_1 (XBUFFER (w->contents));
 
-  if (EQ (BVAR (current_buffer, auto_narrow__narrowing_state), Qneeded))
-    {
-      safe_call (1, Qauto_narrow_mode);
-      /* Normally set by auto-narrow-mode, set it here anyway as a safety measure.  */
-      bset_auto_narrow__narrowing_state (current_buffer, Qauto);
-      message1 ("Auto-Narrow mode enabled in current buffer");
-    }
-
   current_matrix_up_to_date_p
     = (w->window_end_valid
        && !current_buffer->clip_changed
@@ -27684,12 +27667,7 @@ decode_mode_spec (struct window *w, register int c, int field_width,
 
     case 'n':
       if (BUF_BEGV (b) > BUF_BEG (b) || BUF_ZV (b) < BUF_Z (b))
-	{
-	  if (! BUFFER_AUTO_NARROWED_P (b))
-	    return " Narrow";
-	  else
-	    return " Auto-Narrow";
-	}
+	return " Narrow";
       break;
 
       /* Display the "degree of travel" of the window through the buffer.  */
@@ -27697,27 +27675,17 @@ decode_mode_spec (struct window *w, register int c, int field_width,
       {
         ptrdiff_t toppos = marker_position (w->start);
         ptrdiff_t botpos = BUF_Z (b) - w->window_end_pos;
-	ptrdiff_t beg, z;
+        ptrdiff_t begv = BUF_BEGV (b);
+        ptrdiff_t zv = BUF_ZV (b);
 
-	if (! BUFFER_AUTO_NARROWED_P (b))
-	  {
-	    beg = BUF_BEGV (b);
-	    z = BUF_ZV (b);
-	  }
-	else
-	  {
-	    beg = BUF_BEG (b);
-	    z = BUF_Z (b);
-	  }
-
-        if (z <= botpos)
-          return toppos <= beg ? "All" : "Bottom";
-        else if (toppos <= beg)
+        if (zv <= botpos)
+          return toppos <= begv ? "All" : "Bottom";
+        else if (toppos <= begv)
           return "Top";
         else
           {
           sprintf (decode_mode_spec_buf, "%2d%%",
-                   percent99 (toppos - beg, (toppos - beg) + (z - botpos)));
+                   percent99 (toppos - begv, (toppos - begv) + (zv - botpos)));
           return decode_mode_spec_buf;
           }
       }
@@ -27726,27 +27694,17 @@ decode_mode_spec (struct window *w, register int c, int field_width,
     case 'p':
       {
 	ptrdiff_t pos = marker_position (w->start);
-	ptrdiff_t beg, z;
+	ptrdiff_t begv = BUF_BEGV (b);
+	ptrdiff_t zv = BUF_ZV (b);
 
-	if (! BUFFER_AUTO_NARROWED_P (b))
-	  {
-	    beg = BUF_BEGV (b);
-	    z = BUF_ZV (b);
-	  }
-	else
-	  {
-	    beg = BUF_BEG (b);
-	    z = BUF_Z (b);
-	  }
-
-	if (w->window_end_pos <= BUF_Z (b) - z)
-	  return pos <= beg ? "All" : "Bottom";
-	else if (pos <= beg)
+	if (w->window_end_pos <= BUF_Z (b) - zv)
+	  return pos <= begv ? "All" : "Bottom";
+	else if (pos <= begv)
 	  return "Top";
 	else
 	  {
 	    sprintf (decode_mode_spec_buf, "%2d%%",
-		     percent99 (pos - beg, z - beg));
+		     percent99 (pos - begv, zv - begv));
 	    return decode_mode_spec_buf;
 	  }
       }
@@ -27756,26 +27714,16 @@ decode_mode_spec (struct window *w, register int c, int field_width,
       {
 	ptrdiff_t toppos = marker_position (w->start);
 	ptrdiff_t botpos = BUF_Z (b) - w->window_end_pos;
-	ptrdiff_t beg, z;
+	ptrdiff_t begv = BUF_BEGV (b);
+	ptrdiff_t zv = BUF_ZV (b);
 
-	if (! BUFFER_AUTO_NARROWED_P (b))
-	  {
-	    beg = BUF_BEGV (b);
-	    z = BUF_ZV (b);
-	  }
-	else
-	  {
-	    beg = BUF_BEG (b);
-	    z = BUF_Z (b);
-	  }
-
-	if (z <= botpos)
-	  return toppos <= beg ? "All" : "Bottom";
+	if (zv <= botpos)
+	  return toppos <= begv ? "All" : "Bottom";
 	else
 	  {
 	    sprintf (decode_mode_spec_buf,
-		     &"Top%2d%%"[beg < toppos ? sizeof "Top" - 1 : 0],
-		     percent99 (botpos - beg, z - beg));
+		     &"Top%2d%%"[begv < toppos ? sizeof "Top" - 1 : 0],
+		     percent99 (botpos - begv, zv - begv));
 	    return decode_mode_spec_buf;
 	  }
       }
@@ -27786,25 +27734,15 @@ decode_mode_spec (struct window *w, register int c, int field_width,
       {
         ptrdiff_t toppos = marker_position (w->start);
         ptrdiff_t botpos = BUF_Z (b) - w->window_end_pos;
-        ptrdiff_t beg, z;
+        ptrdiff_t begv = BUF_BEGV (b);
+        ptrdiff_t zv = BUF_ZV (b);
         int top_perc, bot_perc;
 
-	if (! BUFFER_AUTO_NARROWED_P (b))
-	  {
-	    beg = BUF_BEGV (b);
-	    z = BUF_ZV (b);
-	  }
-	else
-	  {
-	    beg = BUF_BEG (b);
-	    z = BUF_Z (b);
-	  }
-
-        if ((toppos <= beg) && (z <= botpos))
+        if ((toppos <= begv) && (zv <= botpos))
           return "All   ";
 
-        top_perc = toppos <= beg ? 0 : percent99 (toppos - beg, z - beg);
-        bot_perc = z <= botpos ? 100 : percent99 (botpos - beg, z - beg);
+        top_perc = toppos <= begv ? 0 : percent99 (toppos - begv, zv - begv);
+        bot_perc = zv <= botpos ? 100 : percent99 (botpos - begv, zv - begv);
 
         if (top_perc == bot_perc)
           sprintf (decode_mode_spec_buf, "%d%%", top_perc);
@@ -35892,8 +35830,6 @@ be let-bound around code that needs to disable messages temporarily. */);
   DEFSYM (Qinhibit_point_motion_hooks, "inhibit-point-motion-hooks");
   DEFSYM (Qeval, "eval");
   DEFSYM (QCdata, ":data");
-  DEFSYM (Qneeded, "needed");
-  DEFSYM (Qauto, "auto");
 
   /* Names of text properties relevant for redisplay.  */
   DEFSYM (Qdisplay, "display");