[PATCH] Emacs: Fix notmuch-message-summary-face definition

[Teemu Likonen <tlikonen@iki.fi>]

Emacs face definition forms are either

    ((DISPLAY . PLIST)
     (DISPLAY . PLIST))

or

    ((DISPLAY PLIST)   ;For backward compatibility.
     (DISPLAY PLIST))

Commit a2388bc56e55da5d5695816818274f8a84b0ed92 (2020-08-08) follows
neither of the correct formats. It defines:

    `((((class color) (background light))
       ,@(and (>= emacs-major-version 27) '(:extend t))
       (:background "#f0f0f0"))
      (((class color) (background dark))
       ,@(and (>= emacs-major-version 27) '(:extend t))
       (:background "#303030")))

which produces:

    ((DISPLAY
      :extend t (:background "#f0f0f0"))
     (DISPLAY
      :extend t (:background "#303030")))

And that is wrong format.

This change fixes the face definition form to produce:

    ((DISPLAY
      (:background "#f0f0f0" :extend t))
     (DISPLAY
      (:background "#303030" :extend t)))

which follows the (DISPLAY PLIST) format (see above).
---
 emacs/notmuch.el | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index babddbb6..16227b5c 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -274,11 +274,9 @@ there will be called at other points of notmuch execution."
 
 (defface notmuch-message-summary-face
   `((((class color) (background light))
-     ,@(and (>= emacs-major-version 27) '(:extend t))
-     (:background "#f0f0f0"))
+     (:background "#f0f0f0" ,@(if (>= emacs-major-version 27) '(:extend t))))
     (((class color) (background dark))
-     ,@(and (>= emacs-major-version 27) '(:extend t))
-     (:background "#303030")))
+     (:background "#303030" ,@(if (>= emacs-major-version 27) '(:extend t)))))
   "Face for the single-line message summary in notmuch-show-mode."
   :group 'notmuch-show
   :group 'notmuch-faces)
-- 
2.20.1