Merge from origin/emacs-26

fc5cae7 ; Fix ChangeLog typo.
e17a5e5 ; make change-history-commit
f205928 * etc/HISTORY: Cite Brinkoff on early history.
4e58ca8 Document internal use of 'above-suspended' z-group frame para...
4bd43b0 Increase max-lisp-eval-depth adjustment while in debugger (bu...
ab98352 Improve on last change in replace-buffer-contents
2f149c0 Fix a factual error in Introduction to Emacs Lisp
8ad50a3 ; * lisp/files.el (buffer-offer-save): Doc fix.  (Bug#32000)
c80f31f Minor improvements in documentation of imenu.el
8ebb683 Avoid errors with recentering in 'skeleton-insert'
e980a3c * src/lisp.h: Omit obsolete comment re bytecode stack.
eec71eb Speed up replace-buffer-contents
93c41ce Remove extra process call from vc-git-find-file-hook
7ea0873 ; Update some commentary
4a7f423 Speed up vc-git-dir-status-files
9134c84 Avoid compiler warning using coding.h

Conflicts:
	src/editfns.c

diff --cc doc/lispintro/emacs-lisp-intro.texi
Simple merge

diff --cc lisp/emacs-lisp/debug.el
Simple merge

diff --cc lisp/files.el
Simple merge

diff --cc lisp/imenu.el
Simple merge

diff --cc lisp/skeleton.el
Simple merge

diff --cc lisp/vc/vc-git.el
Simple merge

diff --cc src/coding.h
Simple merge

diff --cc src/editfns.c
index efe83e811ba80666aeb10da8c75f043d7708e3f8,9002211714007854a9430d7c7aea525aba2c6f04..e16a554de200406665a9b5c68353b7dd15f2cd0d
--- 1/src/editfns.c
--- 2/src/editfns.c
+++ b/src/editfns.c
@@@ -3232,9 -3226,37 +3240,36 @@@ differences between the two buffers.  *
       early.  */
    eassert (! early_abort);
  
+   rbc_quitcounter = 0;
+ 
    Fundo_boundary ();
 -  ptrdiff_t count = SPECPDL_INDEX ();
 -  record_unwind_protect (save_excursion_restore, save_excursion_save ());
+   bool modification_hooks_inhibited = false;
 +  record_unwind_protect_excursion ();
  
+   /* We are going to make a lot of small modifications, and having the
+      modification hooks called for each of them will slow us down.
+      Instead, we announce a single modification for the entire
+      modified region.  But don't do that if the caller inhibited
+      modification hooks, because then they don't want that.  */
+   ptrdiff_t from, to;
+   if (!inhibit_modification_hooks)
+     {
+       ptrdiff_t k, l;
+ 
+       /* Find the first character position to be changed.  */
+       for (k = 0; k < size_a && !bit_is_set (ctx.deletions, k); k++)
+       ;
+       from = BEGV + k;
+ 
+       /* Find the last character position to be changed.  */
+       for (l = size_a; l > 0 && !bit_is_set (ctx.deletions, l - 1); l--)
+       ;
+       to = BEGV + l;
+       prepare_to_modify_buffer (from, to, NULL);
+       specbind (Qinhibit_modification_hooks, Qt);
+       modification_hooks_inhibited = true;
+     }
+ 
    ptrdiff_t i = size_a;
    ptrdiff_t j = size_b;
    /* Walk backwards through the lists of changes.  This was also
@@@ -3280,8 -3299,18 +3312,17 @@@
        --i;
        --j;
      }
 -  unbind_to (count, Qnil);
 -  SAFE_FREE ();
++  SAFE_FREE_UNBIND_TO (count, Qnil);
+   rbc_quitcounter = 0;
  
-   return SAFE_FREE_UNBIND_TO (count, Qnil);
+   if (modification_hooks_inhibited)
+     {
+       ptrdiff_t updated_to = to + ZV - BEGV - size_a;
+       signal_after_change (from, to - from, updated_to - from);
+       update_compositions (from, updated_to, CHECK_INSIDE);
+     }
+ 
+   return Qnil;
  }
  
  static void

diff --cc src/eval.c
Simple merge

diff --cc src/lisp.h
Simple merge

diff --cc src/w32fns.c
Simple merge

diff --cc src/xterm.c
Simple merge