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Don't clobber match data in modification hooks

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Since modification hooks run just after any function that changes buffer
contents, it's important to save the match data, or else the code doing
the modification can become really confused.  See also Emacs bugs #23917
and #23869.

* yasnippet.el (yas--on-field-overlay-modification): Wrap main body in
`save-match-data'.
This commit is contained in:
Noam Postavsky 2016-07-12 19:59:43 -04:00
parent 7661dc161d
commit 0db65ee0bb
1 changed files with 9 additions and 8 deletions
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yasnippet.el
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@ -3416,6 +3416,7 @@ field start. This hook does nothing if an undo is in progress."
(let* ((inhibit-modification-hooks t)
(field (overlay-get overlay 'yas--field))
(snippet (overlay-get yas--active-field-overlay 'yas--snippet)))
(save-match-data
(when (yas--skip-and-clear-field-p field beg end length)
;; We delete text starting from the END of insertion.
(yas--skip-and-clear field end))
@ -3423,7 +3424,7 @@ field start. This hook does nothing if an undo is in progress."
(yas--advance-end-maybe field (overlay-end overlay))
(save-excursion
(yas--field-update-display field))
(yas--update-mirrors snippet))))
(yas--update-mirrors snippet)))))
;;; Apropos protection overlays:
;;