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(delete-selection-pre-hook): Avoid clearing out

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pre-command-hook when text is read-only.
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Martin Rudalics 2008-01-24 09:46:40 +00:00
parent fddde1f0b5
commit 578877a1fd
2 changed files with 22 additions and 1 deletions
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18
lisp/delsel.el
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@ -113,7 +113,23 @@ any selection."
;; stop safe_run_hooks from clearing out pre-command-hook.
(and (eq inhibit-quit 'pre-command-hook)
(setq inhibit-quit 'delete-selection-dummy))
(signal 'file-supersession (cdr data)))))))
(signal 'file-supersession (cdr data)))
(text-read-only
;; This signal may come either from `delete-active-region' or
;; `self-insert-command' (when `overwrite-mode' is non-nil).
;; To avoid clearing out `pre-command-hook' we handle this case
;; by issuing a simple message. Note, however, that we do not
;; handle all related problems: When read-only text ends before
;; the end of the region, the latter is not deleted but any
;; subsequent insertion will succeed. We could avoid this case
;; by doing a (setq this-command 'ignore) here. This would,
;; however, still not handle the case where read-only text ends
;; precisely where the region starts: In that case the deletion
;; would succeed but the subsequent insertion would fail with a
;; text-read-only error. To handle that case we would have to
;; investigate text properties at both ends of the region and
;; skip the deletion when inserting text is forbidden there.
(message "Text is read-only") (ding))))))
(put 'self-insert-command 'delete-selection t)
(put 'self-insert-iso 'delete-selection t)