Merge from origin/emacs-26

f64c277 (origin/emacs-26) Let bookmark-jump override window-point (Bu...
1208aaa Omit keymap from subword-mode docstring (Bug#32212)
2b70b54 Prevent line-mode term from showing user passwords
5de4441 Check for special filenames in eshell (Bug#30724)
1b4b965 Fix indent-sexp of #s(...) (Bug#31984)
59e8533 Add save-match-data to abbreviate-file-name (Bug#32201)
47f75b1 Fix last change in editfns.c
671dc5a Fix calls to buffer modification hooks from replace-buffer-co...
cc4ceed ; etc/NEWS: Remove unnecessary reference to a bug number.
e0f33ea Fix Bug#32226
7308fa0 Improve doc strings of several variables in keyboard.c

2 files changed, 16 insertions, 14 deletions

diff --git a/src/editfns.c b/src/editfns.c
index 09f836c3eb4..1d6040da3f7 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -3267,7 +3267,7 @@ differences between the two buffers.  */)
       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--)
+      for (l = size_a; l > k && !bit_is_set (ctx.deletions, l - 1); l--)
         ;
       to = BEGV + l;
       prepare_to_modify_buffer (from, to, NULL);
diff --git a/src/keyboard.c b/src/keyboard.c
index 01d7ce9d5e0..7ab9a6069ad 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -11820,10 +11820,10 @@ if the command is in this list, the selection is not updated.  */);
 
   DEFVAR_LISP ("debug-on-event",
                Vdebug_on_event,
-               doc: /* Enter debugger on this event.  When Emacs
-receives the special event specified by this variable, it will try to
-break into the debugger as soon as possible instead of processing the
-event normally through `special-event-map'.
+               doc: /* Enter debugger on this event.
+When Emacs receives the special event specified by this variable,
+it will try to break into the debugger as soon as possible instead
+of processing the event normally through `special-event-map'.
 
 Currently, the only supported values for this
 variable are `sigusr1' and `sigusr2'.  */);
@@ -11831,21 +11831,23 @@ variable are `sigusr1' and `sigusr2'.  */);
 
   DEFVAR_BOOL ("attempt-stack-overflow-recovery",
                attempt_stack_overflow_recovery,
-               doc: /* If non-nil, attempt to recover from C stack
-overflow.  This recovery is unsafe and may lead to deadlocks or data
+               doc: /* If non-nil, attempt to recover from C stack overflows.
+This recovery is potentially unsafe and may lead to deadlocks or data
 corruption, but it usually works and may preserve modified buffers
 that would otherwise be lost.  If nil, treat stack overflow like any
-other kind of crash.  */);
+other kind of crash or fatal error.  */);
   attempt_stack_overflow_recovery = true;
 
   DEFVAR_BOOL ("attempt-orderly-shutdown-on-fatal-signal",
                attempt_orderly_shutdown_on_fatal_signal,
-               doc: /* If non-nil, attempt to perform an orderly
-shutdown when Emacs receives a fatal signal (e.g., a crash).
-This cleanup is unsafe and may lead to deadlocks or data corruption,
-but it usually works and may preserve modified buffers that would
-otherwise be lost.  If nil, crash immediately in response to fatal
-signals.  */);
+               doc: /* If non-nil, attempt orderly shutdown on fatal signals.
+By default this variable is non-nil, and Emacs attempts to perform
+an orderly shutdown when it catches a fatal signal (e.g., a crash).
+The orderly shutdown includes an attempt to auto-save your unsaved edits
+and other useful cleanups.  These cleanups are potentially unsafe and may
+lead to deadlocks or data corruption, but it usually works and may
+preserve data in modified buffers that would otherwise be lost.
+If nil, Emacs crashes immediately in response to fatal signals.  */);
   attempt_orderly_shutdown_on_fatal_signal = true;
 
   /* Create the initial keyboard.  Qt means 'unset'.  */