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[Emacs-diffs] emacs-24 r116855: Undo in region after markers in undo his
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From: |
Barry O'Reilly |
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Subject: |
[Emacs-diffs] emacs-24 r116855: Undo in region after markers in undo history relocated |
|
Date: |
Tue, 25 Mar 2014 02:30:28 +0000 |
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User-agent: |
Bazaar (2.6b2) |
------------------------------------------------------------
revno: 116855
revision-id: address@hidden
parent: address@hidden
fixes bug: http://debbugs.gnu.org/16818
committer: Barry O'Reilly <address@hidden>
branch nick: emacs-24
timestamp: Mon 2014-03-24 22:47:39 -0400
message:
Undo in region after markers in undo history relocated
* simple.el (primitive-undo): Only process marker adjustments
validated against their corresponding (TEXT . POS). Issue warning
for lone marker adjustments in undo history. (Bug#16818)
(undo-make-selective-list): Add marker adjustments to selective
undo list based on whether their corresponding (TEXT . POS) is in
the region. Remove variable adjusted-markers, which was unused
and only non nil during undo-make-selective-list.
(undo-elt-in-region): Return nil when passed a marker adjustment
and explain in function doc.
Have (MARKER . ADJUSTMENT) undo records always be immediately
after their corresponding (TEXT . POS) record in undo list.
(Bug#16818)
* lisp.h (record-delete): New arg record_markers.
(record_marker_adjustment): No longer needed outside undo.c.
* insdel.c (adjust_markers_for_delete): Move calculation of marker
adjustments to undo.c's record_marker_adjustments. Note that
fileio.c's decide_coding_unwind is another caller to
adjust_markers_for_delete. Because it has undo list bound to t,
it does not rely on adjust_markers_for_delete to record marker
adjustments.
(del_range_2): Swap call to record_delete and
adjust_markers_for_delete so as undo marker adjustments are
recorded before current deletion's adjustments, as before.
(adjust_after_replace):
(replace_range): Pass value for new record_markers arg to
delete_record.
* undo.c (record_marker_adjustment): Renamed to
record_marker_adjustments and made static.
(record_delete): Check record_markers arg and call
record_marker_adjustments.
(record_change): Pass value for new record_markers arg to
delete_record.
(record_point): at_boundary calculation no longer needs to account
for marker adjustments.
* undo-tests.el (undo-test-marker-adjustment-nominal):
(undo-test-region-t-marker): New tests of marker adjustments.
(undo-test-marker-adjustment-moved):
(undo-test-region-mark-adjustment): New tests to demonstrate
bug#16818, which fail without the fix.
* markers.texi (Moving Marker Positions): The 2014-03-02 doc
change mentioning undo's inability to handle relocated markers no
longer applies. See bug#16818.
* text.texi (Undo): Expand documentation of (TEXT . POS) and
(MARKER . ADJUSTMENT) undo elements.
modified:
doc/lispref/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-6155
doc/lispref/markers.texi
markers.texi-20091113204419-o5vbwnq5f7feedwu-6198
doc/lispref/text.texi text.texi-20091113204419-o5vbwnq5f7feedwu-6215
lisp/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-1432
lisp/simple.el simple.el-20091113204419-o5vbwnq5f7feedwu-403
src/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-1438
src/insdel.c insdel.c-20091113204419-o5vbwnq5f7feedwu-175
src/lisp.h lisp.h-20091113204419-o5vbwnq5f7feedwu-253
src/undo.c undo.c-20091113204419-o5vbwnq5f7feedwu-206
test/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-8588
test/automated/undo-tests.el undotests.el-20130108184711-brlnvjau5r1ardib-1
=== modified file 'doc/lispref/ChangeLog'
--- a/doc/lispref/ChangeLog 2014-03-22 19:54:48 +0000
+++ b/doc/lispref/ChangeLog 2014-03-25 02:47:39 +0000
@@ -1,3 +1,11 @@
+2014-03-24 Barry O'Reilly <address@hidden>
+
+ * markers.texi (Moving Marker Positions): The 2014-03-02 doc
+ change mentioning undo's inability to handle relocated markers no
+ longer applies. See bug#16818.
+ * text.texi (Undo): Expand documentation of (TEXT . POS) and
+ (MARKER . ADJUSTMENT) undo elements.
+
2014-03-22 Glenn Morris <address@hidden>
* commands.texi (Defining Commands): List interactive-only values.
=== modified file 'doc/lispref/markers.texi'
--- a/doc/lispref/markers.texi 2014-03-02 17:49:02 +0000
+++ b/doc/lispref/markers.texi 2014-03-25 02:47:39 +0000
@@ -344,12 +344,10 @@
@section Moving Marker Positions
This section describes how to change the position of an existing
-marker. When you do this, be sure you know how the marker is used
-outside of your program. For example, moving a marker to an unrelated
-new position can cause undo to later adjust the marker incorrectly.
-Often when you wish to relocate a marker to an unrelated position, it
-is preferable to make a new marker and set the prior one to point
-nowhere.
+marker. When you do this, be sure you know whether the marker is used
+outside of your program, and, if so, what effects will result from
+moving it---otherwise, confusing things may happen in other parts of
+Emacs.
@defun set-marker marker position &optional buffer
This function moves @var{marker} to @var{position}
=== modified file 'doc/lispref/text.texi'
--- a/doc/lispref/text.texi 2014-03-18 21:14:36 +0000
+++ b/doc/lispref/text.texi 2014-03-25 02:47:39 +0000
@@ -1270,7 +1270,8 @@
The deleted text itself is the string @var{text}. The place to
reinsert it is @code{(abs @var{position})}. If @var{position} is
positive, point was at the beginning of the deleted text, otherwise it
-was at the end.
+was at the end. Zero or more (@var{marker} . @var{adjustment})
+elements follow immediately after this element.
@item (t . @var{time-flag})
This kind of element indicates that an unmodified buffer became
@@ -1296,8 +1297,10 @@
@item (@var{marker} . @var{adjustment})
This kind of element records the fact that the marker @var{marker} was
relocated due to deletion of surrounding text, and that it moved
address@hidden character positions. Undoing this element moves
address@hidden @minus{} @var{adjustment} characters.
address@hidden character positions. If the marker's location is
+consistent with the (@var{text} . @var{position}) element preceding it
+in the undo list, then undoing this element moves @var{marker}
address@hidden @var{adjustment} characters.
@item (apply @var{funname} . @var{args})
This is an extensible undo item, which is undone by calling
=== modified file 'lisp/ChangeLog'
--- a/lisp/ChangeLog 2014-03-24 22:38:06 +0000
+++ b/lisp/ChangeLog 2014-03-25 02:47:39 +0000
@@ -1,3 +1,15 @@
+2014-03-24 Barry O'Reilly <address@hidden>
+
+ * simple.el (primitive-undo): Only process marker adjustments
+ validated against their corresponding (TEXT . POS). Issue warning
+ for lone marker adjustments in undo history. (Bug#16818)
+ (undo-make-selective-list): Add marker adjustments to selective
+ undo list based on whether their corresponding (TEXT . POS) is in
+ the region. Remove variable adjusted-markers, which was unused
+ and only non nil during undo-make-selective-list.
+ (undo-elt-in-region): Return nil when passed a marker adjustment
+ and explain in function doc.
+
2014-03-24 Dmitry Gutov <address@hidden>
* emacs-lisp/package.el (package--add-to-archive-contents):
=== modified file 'lisp/simple.el'
--- a/lisp/simple.el 2014-03-23 22:30:47 +0000
+++ b/lisp/simple.el 2014-03-25 02:47:39 +0000
@@ -2289,24 +2289,41 @@
(when (let ((apos (abs pos)))
(or (< apos (point-min)) (> apos (point-max))))
(error "Changes to be undone are outside visible portion of
buffer"))
- (if (< pos 0)
- (progn
- (goto-char (- pos))
- (insert string))
- (goto-char pos)
- ;; Now that we record marker adjustments
- ;; (caused by deletion) for undo,
- ;; we should always insert after markers,
- ;; so that undoing the marker adjustments
- ;; put the markers back in the right place.
- (insert string)
- (goto-char pos)))
+ (let (valid-marker-adjustments)
+ ;; Check that marker adjustments which were recorded
+ ;; with the (STRING . POS) record are still valid, ie
+ ;; the markers haven't moved. We check their validity
+ ;; before reinserting the string so as we don't need to
+ ;; mind marker insertion-type.
+ (while (and (markerp (car-safe (car list)))
+ (integerp (cdr-safe (car list))))
+ (let* ((marker-adj (pop list))
+ (m (car marker-adj)))
+ (and (eq (marker-buffer m) (current-buffer))
+ (= pos m)
+ (push marker-adj valid-marker-adjustments))))
+ ;; Insert string and adjust point
+ (if (< pos 0)
+ (progn
+ (goto-char (- pos))
+ (insert string))
+ (goto-char pos)
+ (insert string)
+ (goto-char pos))
+ ;; Adjust the valid marker adjustments
+ (dolist (adj valid-marker-adjustments)
+ (set-marker (car adj)
+ (- (car adj) (cdr adj))))))
;; (MARKER . OFFSET) means a marker MARKER was adjusted by OFFSET.
(`(,(and marker (pred markerp)) . ,(and offset (pred integerp)))
- (when (marker-buffer marker)
- (set-marker marker
- (- marker offset)
- (marker-buffer marker))))
+ (warn "Encountered %S entry in undo list with no matching (TEXT .
POS) entry"
+ next)
+ ;; Even though these elements are not expected in the undo
+ ;; list, adjust them to be conservative for the 24.4
+ ;; release. (Bug#16818)
+ (set-marker marker
+ (- marker offset)
+ (marker-buffer marker)))
(_ (error "Unrecognized entry in undo list %S" next))))
(setq arg (1- arg)))
;; Make sure an apply entry produces at least one undo entry,
@@ -2341,8 +2358,6 @@
(undo-make-selective-list (min beg end) (max beg end))
buffer-undo-list)))
-(defvar undo-adjusted-markers)
-
(defun undo-make-selective-list (start end)
"Return a list of undo elements for the region START to END.
The elements come from `buffer-undo-list', but we keep only
@@ -2351,7 +2366,6 @@
we stop and ignore all further elements."
(let ((undo-list-copy (undo-copy-list buffer-undo-list))
(undo-list (list nil))
- undo-adjusted-markers
some-rejected
undo-elt temp-undo-list delta)
(while undo-list-copy
@@ -2361,15 +2375,30 @@
;; This is a "was unmodified" element.
;; Keep it if we have kept everything thus far.
(not some-rejected))
+ ;; Skip over marker adjustments, instead relying on
+ ;; finding them after (TEXT . POS) elements
+ ((markerp (car-safe undo-elt))
+ nil)
(t
(undo-elt-in-region undo-elt start end)))))
(if keep-this
(progn
(setq end (+ end (cdr (undo-delta undo-elt))))
;; Don't put two nils together in the list
- (if (not (and (eq (car undo-list) nil)
- (eq undo-elt nil)))
- (setq undo-list (cons undo-elt undo-list))))
+ (when (not (and (eq (car undo-list) nil)
+ (eq undo-elt nil)))
+ (setq undo-list (cons undo-elt undo-list))
+ ;; If (TEXT . POS), "keep" its subsequent (MARKER
+ ;; . ADJUSTMENT) whose markers haven't moved.
+ (when (and (stringp (car-safe undo-elt))
+ (integerp (cdr-safe undo-elt)))
+ (let ((list-i (cdr undo-list-copy)))
+ (while (markerp (car-safe (car list-i)))
+ (let* ((adj-elt (pop list-i))
+ (m (car adj-elt)))
+ (and (eq (marker-buffer m) (current-buffer))
+ (= (cdr undo-elt) m)
+ (push adj-elt undo-list))))))))
(if (undo-elt-crosses-region undo-elt start end)
(setq undo-list-copy nil)
(setq some-rejected t)
@@ -2417,7 +2446,12 @@
(defun undo-elt-in-region (undo-elt start end)
"Determine whether UNDO-ELT falls inside the region START ... END.
-If it crosses the edge, we return nil."
+If it crosses the edge, we return nil.
+
+Generally this function is not useful for determining
+whether (MARKER . ADJUSTMENT) undo elements are in the region,
+because markers can be arbitrarily relocated. Instead, pass the
+marker adjustment's corresponding (TEXT . POS) element."
(cond ((integerp undo-elt)
(and (>= undo-elt start)
(<= undo-elt end)))
@@ -2430,17 +2464,8 @@
(and (>= (abs (cdr undo-elt)) start)
(<= (abs (cdr undo-elt)) end)))
((and (consp undo-elt) (markerp (car undo-elt)))
- ;; This is a marker-adjustment element (MARKER . ADJUSTMENT).
- ;; See if MARKER is inside the region.
- (let ((alist-elt (assq (car undo-elt) undo-adjusted-markers)))
- (unless alist-elt
- (setq alist-elt (cons (car undo-elt)
- (marker-position (car undo-elt))))
- (setq undo-adjusted-markers
- (cons alist-elt undo-adjusted-markers)))
- (and (cdr alist-elt)
- (>= (cdr alist-elt) start)
- (<= (cdr alist-elt) end))))
+ ;; (MARKER . ADJUSTMENT)
+ (<= start (car undo-elt) end))
((null (car undo-elt))
;; (nil PROPERTY VALUE BEG . END)
(let ((tail (nthcdr 3 undo-elt)))
=== modified file 'src/ChangeLog'
--- a/src/ChangeLog 2014-03-24 08:50:17 +0000
+++ b/src/ChangeLog 2014-03-25 02:47:39 +0000
@@ -1,3 +1,31 @@
+2014-03-24 Barry O'Reilly <address@hidden>
+
+ Have (MARKER . ADJUSTMENT) undo records always be immediately
+ after their corresponding (TEXT . POS) record in undo list.
+ (Bug#16818)
+ * lisp.h (record-delete): New arg record_markers.
+ (record_marker_adjustment): No longer needed outside undo.c.
+ * insdel.c (adjust_markers_for_delete): Move calculation of marker
+ adjustments to undo.c's record_marker_adjustments. Note that
+ fileio.c's decide_coding_unwind is another caller to
+ adjust_markers_for_delete. Because it has undo list bound to t,
+ it does not rely on adjust_markers_for_delete to record marker
+ adjustments.
+ (del_range_2): Swap call to record_delete and
+ adjust_markers_for_delete so as undo marker adjustments are
+ recorded before current deletion's adjustments, as before.
+ (adjust_after_replace):
+ (replace_range): Pass value for new record_markers arg to
+ delete_record.
+ * undo.c (record_marker_adjustment): Renamed to
+ record_marker_adjustments and made static.
+ (record_delete): Check record_markers arg and call
+ record_marker_adjustments.
+ (record_change): Pass value for new record_markers arg to
+ delete_record.
+ (record_point): at_boundary calculation no longer needs to account
+ for marker adjustments.
+
2014-03-24 Martin Rudalics <address@hidden>
* w32term.c (x_set_window_size): Refine fix from 2014-03-14
=== modified file 'src/insdel.c'
--- a/src/insdel.c 2014-01-01 17:44:48 +0000
+++ b/src/insdel.c 2014-03-25 02:47:39 +0000
@@ -233,34 +233,9 @@
/* Here's the case where a marker is inside text being deleted. */
else if (charpos > from)
{
- if (! m->insertion_type)
- { /* Normal markers will end up at the beginning of the
- re-inserted text after undoing a deletion, and must be
- adjusted to move them to the correct place. */
- XSETMISC (marker, m);
- record_marker_adjustment (marker, from - charpos);
- }
- else if (charpos < to)
- { /* Before-insertion markers will automatically move forward
- upon re-inserting the deleted text, so we have to arrange
- for them to move backward to the correct position. */
- XSETMISC (marker, m);
- record_marker_adjustment (marker, to - charpos);
- }
m->charpos = from;
m->bytepos = from_byte;
}
- /* Here's the case where a before-insertion marker is immediately
- before the deleted region. */
- else if (charpos == from && m->insertion_type)
- {
- /* Undoing the change uses normal insertion, which will
- incorrectly make MARKER move forward, so we arrange for it
- to then move backward to the correct place at the beginning
- of the deleted region. */
- XSETMISC (marker, m);
- record_marker_adjustment (marker, to - from);
- }
}
}
@@ -1219,7 +1194,7 @@
from + len, from_byte + len_byte, 0);
if (nchars_del > 0)
- record_delete (from, prev_text);
+ record_delete (from, prev_text, false);
record_insert (from, len);
if (len > nchars_del)
@@ -1384,7 +1359,7 @@
if (!NILP (deletion))
{
record_insert (from + SCHARS (deletion), inschars);
- record_delete (from, deletion);
+ record_delete (from, deletion, false);
}
GAP_SIZE -= outgoing_insbytes;
@@ -1716,13 +1691,14 @@
else
deletion = Qnil;
- /* Relocate all markers pointing into the new, larger gap
- to point at the end of the text before the gap.
- Do this before recording the deletion,
- so that undo handles this after reinserting the text. */
+ /* Record marker adjustments, and text deletion into undo
+ history. */
+ record_delete (from, deletion, true);
+
+ /* Relocate all markers pointing into the new, larger gap to point
+ at the end of the text before the gap. */
adjust_markers_for_delete (from, from_byte, to, to_byte);
- record_delete (from, deletion);
MODIFF++;
CHARS_MODIFF = MODIFF;
=== modified file 'src/lisp.h'
--- a/src/lisp.h 2014-02-28 21:45:34 +0000
+++ b/src/lisp.h 2014-03-25 02:47:39 +0000
@@ -4198,9 +4198,8 @@
extern Lisp_Object Qapply;
extern Lisp_Object Qinhibit_read_only;
extern void truncate_undo_list (struct buffer *);
-extern void record_marker_adjustment (Lisp_Object, ptrdiff_t);
extern void record_insert (ptrdiff_t, ptrdiff_t);
-extern void record_delete (ptrdiff_t, Lisp_Object);
+extern void record_delete (ptrdiff_t, Lisp_Object, bool);
extern void record_first_change (void);
extern void record_change (ptrdiff_t, ptrdiff_t);
extern void record_property_change (ptrdiff_t, ptrdiff_t,
=== modified file 'src/undo.c'
--- a/src/undo.c 2014-01-01 07:43:34 +0000
+++ b/src/undo.c 2014-03-25 02:47:39 +0000
@@ -75,27 +75,8 @@
Fundo_boundary ();
last_undo_buffer = current_buffer;
- if (CONSP (BVAR (current_buffer, undo_list)))
- {
- /* Set AT_BOUNDARY only when we have nothing other than
- marker adjustment before undo boundary. */
-
- Lisp_Object tail = BVAR (current_buffer, undo_list), elt;
-
- while (1)
- {
- if (NILP (tail))
- elt = Qnil;
- else
- elt = XCAR (tail);
- if (NILP (elt) || ! (CONSP (elt) && MARKERP (XCAR (elt))))
- break;
- tail = XCDR (tail);
- }
- at_boundary = NILP (elt);
- }
- else
- at_boundary = 1;
+ at_boundary = ! CONSP (BVAR (current_buffer, undo_list))
+ || NILP (XCAR (BVAR (current_buffer, undo_list)));
if (MODIFF <= SAVE_MODIFF)
record_first_change ();
@@ -147,11 +128,61 @@
Fcons (Fcons (lbeg, lend), BVAR (current_buffer, undo_list)));
}
-/* Record that a deletion is about to take place,
- of the characters in STRING, at location BEG. */
+/* Record the fact that markers in the region of FROM, TO are about to
+ be adjusted. This is done only when a marker points within text
+ being deleted, because that's the only case where an automatic
+ marker adjustment won't be inverted automatically by undoing the
+ buffer modification. */
+
+static void
+record_marker_adjustments (ptrdiff_t from, ptrdiff_t to)
+{
+ Lisp_Object marker;
+ register struct Lisp_Marker *m;
+ register ptrdiff_t charpos, adjustment;
+
+ /* Allocate a cons cell to be the undo boundary after this command. */
+ if (NILP (pending_boundary))
+ pending_boundary = Fcons (Qnil, Qnil);
+
+ if (current_buffer != last_undo_buffer)
+ Fundo_boundary ();
+ last_undo_buffer = current_buffer;
+
+ for (m = BUF_MARKERS (current_buffer); m; m = m->next)
+ {
+ charpos = m->charpos;
+ eassert (charpos <= Z);
+
+ if (from <= charpos && charpos <= to)
+ {
+ /* insertion_type nil markers will end up at the beginning of
+ the re-inserted text after undoing a deletion, and must be
+ adjusted to move them to the correct place.
+
+ insertion_type t markers will automatically move forward
+ upon re-inserting the deleted text, so we have to arrange
+ for them to move backward to the correct position. */
+ adjustment = (m->insertion_type ? to : from) - charpos;
+
+ if (adjustment)
+ {
+ XSETMISC (marker, m);
+ bset_undo_list
+ (current_buffer,
+ Fcons (Fcons (marker, make_number (adjustment)),
+ BVAR (current_buffer, undo_list)));
+ }
+ }
+ }
+}
+
+/* Record that a deletion is about to take place, of the characters in
+ STRING, at location BEG. Optionally record adjustments for markers
+ in the region STRING occupies in the current buffer. */
void
-record_delete (ptrdiff_t beg, Lisp_Object string)
+record_delete (ptrdiff_t beg, Lisp_Object string, bool record_markers)
{
Lisp_Object sbeg;
@@ -169,36 +200,17 @@
record_point (beg);
}
+ /* primitive-undo assumes marker adjustments are recorded
+ immediately before the deletion is recorded. See bug 16818
+ discussion. */
+ if (record_markers)
+ record_marker_adjustments (beg, beg + SCHARS (string));
+
bset_undo_list
(current_buffer,
Fcons (Fcons (string, sbeg), BVAR (current_buffer, undo_list)));
}
-/* Record the fact that MARKER is about to be adjusted by ADJUSTMENT.
- This is done only when a marker points within text being deleted,
- because that's the only case where an automatic marker adjustment
- won't be inverted automatically by undoing the buffer modification. */
-
-void
-record_marker_adjustment (Lisp_Object marker, ptrdiff_t adjustment)
-{
- if (EQ (BVAR (current_buffer, undo_list), Qt))
- return;
-
- /* Allocate a cons cell to be the undo boundary after this command. */
- if (NILP (pending_boundary))
- pending_boundary = Fcons (Qnil, Qnil);
-
- if (current_buffer != last_undo_buffer)
- Fundo_boundary ();
- last_undo_buffer = current_buffer;
-
- bset_undo_list
- (current_buffer,
- Fcons (Fcons (marker, make_number (adjustment)),
- BVAR (current_buffer, undo_list)));
-}
-
/* Record that a replacement is about to take place,
for LENGTH characters at location BEG.
The replacement must not change the number of characters. */
@@ -206,7 +218,7 @@
void
record_change (ptrdiff_t beg, ptrdiff_t length)
{
- record_delete (beg, make_buffer_string (beg, beg + length, 1));
+ record_delete (beg, make_buffer_string (beg, beg + length, 1), false);
record_insert (beg, length);
}
=== modified file 'test/ChangeLog'
--- a/test/ChangeLog 2014-03-23 06:00:18 +0000
+++ b/test/ChangeLog 2014-03-25 02:47:39 +0000
@@ -1,3 +1,11 @@
+2014-03-24 Barry O'Reilly <address@hidden>
+
+ * undo-tests.el (undo-test-marker-adjustment-nominal):
+ (undo-test-region-t-marker): New tests of marker adjustments.
+ (undo-test-marker-adjustment-moved):
+ (undo-test-region-mark-adjustment): New tests to demonstrate
+ bug#16818, which fail without the fix.
+
2014-03-23 Daniel Colascione <address@hidden>
* automated/cl-lib.el (cl-lib-keyword-names-versus-values): New
=== modified file 'test/automated/undo-tests.el'
--- a/test/automated/undo-tests.el 2014-03-02 17:37:32 +0000
+++ b/test/automated/undo-tests.el 2014-03-25 02:47:39 +0000
@@ -268,6 +268,104 @@
(should (string= (buffer-string)
"This sentence corrupted?aaa"))))
+(ert-deftest undo-test-marker-adjustment-nominal ()
+ "Test nominal behavior of marker adjustments."
+ (with-temp-buffer
+ (buffer-enable-undo)
+ (insert "abcdefg")
+ (undo-boundary)
+ (let ((m (make-marker)))
+ (set-marker m 2 (current-buffer))
+ (goto-char (point-min))
+ (delete-forward-char 3)
+ (undo-boundary)
+ (should (= (point-min) (marker-position m)))
+ (undo)
+ (undo-boundary)
+ (should (= 2 (marker-position m))))))
+
+(ert-deftest undo-test-region-t-marker ()
+ "Test undo in region containing marker with t insertion-type."
+ (with-temp-buffer
+ (buffer-enable-undo)
+ (transient-mark-mode 1)
+ (insert "abcdefg")
+ (undo-boundary)
+ (let ((m (make-marker)))
+ (set-marker-insertion-type m t)
+ (set-marker m (point-min) (current-buffer)) ; m at a
+ (goto-char (+ 2 (point-min)))
+ (push-mark (point) t t)
+ (setq mark-active t)
+ (goto-char (point-min))
+ (delete-forward-char 1) ;; delete region covering "ab"
+ (undo-boundary)
+ (should (= (point-min) (marker-position m)))
+ ;; Resurrect "ab". m's insertion type means the reinsertion
+ ;; moves it forward 2, and then the marker adjustment returns it
+ ;; to its rightful place.
+ (undo)
+ (undo-boundary)
+ (should (= (point-min) (marker-position m))))))
+
+(ert-deftest undo-test-marker-adjustment-moved ()
+ "Test marker adjustment behavior when the marker moves.
+Demonstrates bug 16818."
+ (with-temp-buffer
+ (buffer-enable-undo)
+ (insert "abcdefghijk")
+ (undo-boundary)
+ (let ((m (make-marker)))
+ (set-marker m 2 (current-buffer)) ; m at b
+ (goto-char (point-min))
+ (delete-forward-char 3) ; m at d
+ (undo-boundary)
+ (set-marker m 4) ; m at g
+ (undo)
+ (undo-boundary)
+ ;; m still at g, but shifted 3 because deletion undone
+ (should (= 7 (marker-position m))))))
+
+(ert-deftest undo-test-region-mark-adjustment ()
+ "Test that the mark's marker adjustment in undo history doesn't
+obstruct undo in region from finding the correct change group.
+Demonstrates bug 16818."
+ (with-temp-buffer
+ (buffer-enable-undo)
+ (transient-mark-mode 1)
+ (insert "First line\n")
+ (insert "Second line\n")
+ (undo-boundary)
+
+ (goto-char (point-min))
+ (insert "aaa")
+ (undo-boundary)
+
+ (undo)
+ (undo-boundary)
+
+ (goto-char (point-max))
+ (insert "bbb")
+ (undo-boundary)
+
+ (push-mark (point) t t)
+ (setq mark-active t)
+ (goto-char (- (point) 3))
+ (delete-forward-char 1)
+ (undo-boundary)
+
+ (insert "bbb")
+ (undo-boundary)
+
+ (goto-char (point-min))
+ (push-mark (point) t t)
+ (setq mark-active t)
+ (goto-char (+ (point) 3))
+ (undo)
+ (undo-boundary)
+
+ (should (string= (buffer-string) "aaaFirst line\nSecond line\nbbb"))))
+
(defun undo-test-all (&optional interactive)
"Run all tests for \\[undo]."
(interactive "p")
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