Make ediff handle remote and quoted file names

Quoted file names need to be unquoted before passed to
subprocesses (Bug#25950).

* lisp/vc/ediff-diff.el (ediff-exec-process): Handle remote and quoted
file names.
* test/lisp/vc/ediff-diff-tests.el
(ediff-diff-tests--ediff-exec-process--quoted-file): Add unit test.

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/vc/ediff-diff.el b/lisp/vc/ediff-diff.el
index 37f22340d71..cfa08ef3604 100644
--- a/lisp/vc/ediff-diff.el
+++ b/lisp/vc/ediff-diff.el
@@ -1149,7 +1149,11 @@ delimiter regions"))
              ediff-coding-system-for-write
            ediff-coding-system-for-read))
         args)
-    (setq args (append (split-string options) files))
+    (setq args (append (split-string options)
+                       (mapcar (lambda (file)
+                                 (file-name-unquote
+                                  (or (file-local-copy file) file)))
+                               files)))
     (setq args (delete "" (delq nil args))) ; delete nil and "" from arguments
     ;; the --binary option, if present, should be used only for buffer jobs
     ;; or for refining the differences