Fix search string generation in nnimap-make-thread-query

* lisp/gnus/nnimap.el (nnimap-make-thread-query): Remove text
properties before constructing the search string (bug#49926).

diff --git a/lisp/gnus/nnimap.el b/lisp/gnus/nnimap.el
index 059101c8907ecab82bbaea7a402484755e1e82dd..6b627a4b75658b4a6ccbd6c94da45120035a530b 100644 (file)
--- a/lisp/gnus/nnimap.el
+++ b/lisp/gnus/nnimap.el
@@ -2287,7 +2287,7 @@ Return the server's response to the SELECT or EXAMINE command."
          nnimap-incoming-split-list)))
 
 (defun nnimap-make-thread-query (header)
-  (let* ((id  (mail-header-id header))
+  (let* ((id (substring-no-properties (mail-header-id header)))
         (refs (split-string
                (or (mail-header-references header)
                    "")))