diff options
Diffstat (limited to 'lisp/delsel.el')
| -rw-r--r-- | lisp/delsel.el | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/lisp/delsel.el b/lisp/delsel.el index 6427c39eec..990ca91ace 100644 --- a/lisp/delsel.el +++ b/lisp/delsel.el @@ -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) |