This dynamically bound variable can be set when the caller of
notmuch-show guarantees that exactly one message will match the
query. It avoids transporting and parsing the complete thread
 emacs/notmuch-show.el | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index ba93febb..9dca5d7e 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -178,6 +178,8 @@ indentation."
 (defvar-local notmuch-show-indent-content t)
+(defvar-local notmuch-show-single-message nil)
 (defvar notmuch-show-attachment-debug nil
   "If t log stdout and stderr from attachment handlers.
@@ -1314,9 +1316,9 @@ Apply the previously saved STATE if supplied, otherwise 
show the
 first relevant message.
 If no messages match the query return NIL."
-  (let* ((cli-args (cons "--exclude=false"
-                        (and notmuch-show-elide-non-matching-messages
-                             (list "--entire-thread=false"))))
+  (let* ((cli-args (list "--exclude=false"))
+        (cli-args (if notmuch-show-elide-non-matching-messages (cons 
"--entire-thread=false" cli-args) cli-args))
+        (cli-args (if notmuch-show-single-message (cons "--part=0" cli-args) 
         (queries (notmuch-show--build-queries
                   notmuch-show-thread-id notmuch-show-query-context))
         (forest nil)
@@ -1327,6 +1329,8 @@ If no messages match the query return NIL."
     (while (and (not forest) queries)
       (setq forest (notmuch-query-get-threads
                    (append cli-args (list "'") (car queries) (list "'"))))
+      (when (and forest notmuch-show-single-message)
+       (setq forest (list (list (list forest)))))
       (setq queries (cdr queries)))
     (when forest
       (notmuch-show-insert-forest forest)
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