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Fix marker adjustment for undo (Bug#29118)

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* lisp/simple.el (primitive-undo): Compare marker against absolute
value of POS, because the sign of POS is irrelevant to markers.
This commit is contained in:
Noam Postavsky 2017-11-15 07:03:23 -05:00
parent 796c7f7a94
commit 1faade8821
1 changed files with 5 additions and 5 deletions
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10
lisp/simple.el
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@ -2565,10 +2565,10 @@ Return what remains of the list."
(setq did-apply t)))
;; Element (STRING . POS) means STRING was deleted.
(`(,(and string (pred stringp)) . ,(and pos (pred integerp)))
(when (let ((apos (abs pos)))
(or (< apos (point-min)) (> apos (point-max))))
(error "Changes to be undone are outside visible portion of buffer"))
(let (valid-marker-adjustments)
(let ((valid-marker-adjustments nil)
(apos (abs pos)))
(when (or (< apos (point-min)) (> apos (point-max)))
(error "Changes to be undone are outside visible portion of buffer"))
;; 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
@ -2579,7 +2579,7 @@ Return what remains of the list."
(let* ((marker-adj (pop list))
(m (car marker-adj)))
(and (eq (marker-buffer m) (current-buffer))
(= pos m)
(= apos m)
(push marker-adj valid-marker-adjustments))))
;; Insert string and adjust point
(if (< pos 0)