(gnus-summary-set-local-parameters): Don't bind parameters that haven't existed

[gnus] / lisp / gnus-sum.el

diff --git a/lisp/gnus-sum.el b/lisp/gnus-sum.el
index 4f6a565..dc7bde6 100644 (file)
--- a/lisp/gnus-sum.el
+++ b/lisp/gnus-sum.el
@@ -3831,6 +3831,13 @@ This function is intended to be used in
       (and (consp elem)                        ; Has to be a cons.
           (consp (cdr elem))           ; The cdr has to be a list.
           (symbolp (car elem))         ; Has to be a symbol in there.
+
+          ;; Variables like `gnus-show-threads' that are globally bound,
+          ;; if used as group parameters, need to get to be buffer-local,
+          ;; whereas just parameters like `gcc-self', `timestamp', etc.
+          ;; should not be bound as variables.
+          (boundp (car elem))          ; Has to be already bound
+
           (not (memq (car elem) vars))
           (ignore-errors               ; So we set it.
             (push (car elem) vars)