Make `browse-url-of-buffer' work from zip files

* lisp/net/browse-url.el (browse-url-of-buffer): Make `C-c C-v'
work in HTML buffers visited from zip files and the like
(bug#10318).

1 files changed, 12 insertions, 10 deletions

diff --git a/lisp/net/browse-url.el b/lisp/net/browse-url.el
index 135f11f03c7..3151dae0aa2 100644
--- a/lisp/net/browse-url.el
+++ b/lisp/net/browse-url.el
@@ -714,16 +714,18 @@ narrowed."
            (and (not (buffer-narrowed-p))
                 (or buffer-file-name
                     (and (boundp 'dired-directory) dired-directory)))))
-      (or file-name
-          (progn
-            (or browse-url-temp-file-name
-                (setq browse-url-temp-file-name
-                      (convert-standard-filename
-                       (make-temp-file
-                        (expand-file-name "burl" browse-url-temp-dir)
-                        nil ".html"))))
-            (setq file-name browse-url-temp-file-name)
-            (write-region (point-min) (point-max) file-name nil 'no-message)))
+      (when (or (not file-name)
+                ;; This can happen when we're looking at a file from a
+                ;; zip file buffer, for instance.
+                (not (file-exists-p file-name)))
+        (unless browse-url-temp-file-name
+          (setq browse-url-temp-file-name
+                (convert-standard-filename
+                 (make-temp-file
+                  (expand-file-name "burl" browse-url-temp-dir)
+                  nil ".html"))))
+        (setq file-name browse-url-temp-file-name)
+        (write-region (point-min) (point-max) file-name nil 'no-message))
       (browse-url-of-file file-name))))
 
 (defun browse-url-delete-temp-file (&optional temp-file-name)