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master 43982a8: Don't infloop in comint-redirect-results-list-from-proce

From: Lars Ingebrigtsen
Subject: master 43982a8: Don't infloop in comint-redirect-results-list-from-process
Date: Mon, 18 Jan 2021 23:13:15 -0500 (EST)

branch: master
commit 43982a8f1017f709f78d5722796c266d4f72de05
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Don't infloop in comint-redirect-results-list-from-process
    * lisp/comint.el (comint-redirect-results-list-from-process):
    Ensure forward progress (bug#45950).
 lisp/comint.el | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lisp/comint.el b/lisp/comint.el
index 53153af..e52d67d 100644
--- a/lisp/comint.el
+++ b/lisp/comint.el
@@ -3863,7 +3863,11 @@ REGEXP-GROUP is the regular expression group in REGEXP 
to use."
        (push (buffer-substring-no-properties
                (match-beginning regexp-group)
                (match-end regexp-group))
-              results))
+              results)
+        (when (zerop (length (match-string 0)))
+          ;; If the regexp can be empty (for instance, "^.*$"), we
+          ;; don't advance, so ensure forward progress.
+         (forward-line 1)))
       (nreverse results))))
 ;; Converting process modes to use comint mode

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