Since Emacs 27 each face has to be explicitly configured to "extend
to the edge of the window".  Without doing that the face used for
the newline character only has an effect that spans "one character"
(i.e. it looks like there is a single trailing space character).

We don't want that so extend the face in Emacs 27, so that it looks
the same as it did in older Emacs releases.  We have to do this
conditionally, otherwise older Emacsen would choke on it.
 emacs/notmuch.el | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index 4fc338e2..5562ad10 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -273,8 +273,12 @@ (defun notmuch-search-first-thread ()
   (goto-char (point-min)))
 (defface notmuch-message-summary-face
-  '((((class color) (background light)) (:background "#f0f0f0"))
-    (((class color) (background dark)) (:background "#303030")))
+  `((((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")))
   "Face for the single-line message summary in notmuch-show-mode."
   :group 'notmuch-show
   :group 'notmuch-faces)
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