Don't infloop in comint-redirect-results-list-from-process

* lisp/comint.el (comint-redirect-results-list-from-process):
Ensure forward progress (bug#45950).

diff --git a/lisp/comint.el b/lisp/comint.el
index 53153af7d27ef8fe82623f0239c5c8b319c23652..e52d67d0e50d56feda7ad674312c15829980fc67 100644 (file)
--- 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))))
 \f
 ;; Converting process modes to use comint mode