bug#41511: [PATCH] Decode group name before matching against gnus-parameters

[Łukasz Stelmach]

Group names in Gnus are stored and processed as strings of bytes
(e.g. "Wiadomo\305\233ci-\305\233mieci") while regular expressions in
gnus-parameters are encoded as multibyte strings (e.g. "Wiadomości-śmieci")
and matching the latter aginst the former doesn't work. Parameters set
for groups with non-ascii characters in their names cannot be retrieved.

To fix this problem group name needs to be decoded before being matched
against a regexp.

* gnus.el (gnus-parameters-get-parameter, gnus-group-fast-parameter,
gnus-define-group-parameter): Decode a group name before matching against
a regexp.
---
 lisp/gnus/gnus.el | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/lisp/gnus/gnus.el b/lisp/gnus/gnus.el
index caeab7f55a..e7621872d8 100644
--- a/lisp/gnus/gnus.el
+++ b/lisp/gnus/gnus.el
@@ -947,6 +947,7 @@ REST is a plist of following:
                (string-match ,variable name))
               (,variable
                (let ((alist ,variable)
+                     (decoded-name (gnus-group-decoded-name name))
                      elem value)
                  (while (setq elem (pop alist))
                    (when (and name
@@ -959,6 +960,7 @@ REST is a plist of following:
          (and name
               (or (gnus-group-find-parameter name ',param ,(and type t))
                   (let ((alist ,variable)
+                        (decoded-name (gnus-group-decoded-name name))
                         elem value)
                     (while (setq elem (pop alist))
                       (when (and name
@@ -3513,9 +3515,10 @@ You should probably use `gnus-find-method-for-group' 
instead."
   (let ((case-fold-search (if (eq gnus-parameters-case-fold-search 'default)
                              case-fold-search
                            gnus-parameters-case-fold-search))
+       (decoded-group (gnus-group-decoded-name group))
        params-list)
     (dolist (elem gnus-parameters)
-      (when (string-match (car elem) group)
+      (when (string-match (car elem) decoded-group)
        (setq params-list
              (nconc (gnus-expand-group-parameters
                      (car elem) (cdr elem) group)
@@ -3569,7 +3572,8 @@ The function `gnus-group-find-parameter' will do that for 
you."
   (let* ((params (funcall gnus-group-get-parameter-function group))
         ;; Start easy, check the "real" group parameters.
         (simple-results
-         (gnus-group-parameter-value params symbol allow-list t)))
+         (gnus-group-parameter-value params symbol allow-list t))
+        (decoded-group (gnus-group-decoded-name group)))
     (if simple-results
        ;; Found results; return them.
        (car simple-results)
@@ -3582,7 +3586,7 @@ The function `gnus-group-find-parameter' will do that for 
you."
          (setq head (car tail)
                tail (cdr tail))
          ;; The car is regexp matching for matching the group name.
-         (when (string-match (car head) group)
+         (when (string-match (car head) decoded-group)
            ;; The cdr is the parameters.
            (let ((this-result
                   (gnus-group-parameter-value (cdr head) symbol allow-list t)))
-- 
2.20.1