python.el: Don't change `comint-prompt-read-only' globally

Fixes: debbugs:19288

* lisp/progmodes/python.el (inferior-python-mode): Set
`comint-prompt-read-only` to `t` only locally.

2 files changed, 7 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2669e07cd15..df057ac1070 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-09  Fabián Ezequiel Gallina  <fgallina@gnu.org>
+
+        * progmodes/python.el (inferior-python-mode): Set
+        `comint-prompt-read-only` to `t` only locally.
+
 2014-12-08  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
         * net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 33c822a37d5..63597d5f75a 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -2441,8 +2441,8 @@ variable.
   (set (make-local-variable 'python-shell--prompt-calculated-input-regexp) nil)
   (set (make-local-variable 'python-shell--prompt-calculated-output-regexp) nil)
   (python-shell-prompt-set-calculated-regexps)
-  (setq comint-prompt-regexp python-shell--prompt-calculated-input-regexp
-        comint-prompt-read-only t)
+  (setq comint-prompt-regexp python-shell--prompt-calculated-input-regexp)
+  (set (make-local-variable 'comint-prompt-read-only) t)
   (setq mode-line-process '(":%s"))
   (set (make-local-variable 'comint-output-filter-functions)
        '(ansi-color-process-output