When moving between message in a tree or show buffer, the message at
point is marked as read.  Likewise when creating such a buffer, then
the message that is initially at point is supposed to be marked as
read as well.

The latter worked for `notmuch-show' but not for `notmuch-tree'.
Press "RET" or "M-RET" in a search buffer to observe these behaviors.

In both cases the marking is supposed to be done by the function
`notmuch-show-command-hook'.  In the case of `notmuch-show' that
function is added directly to `post-command-hook'.

`notmuch-tree' instead adds the function `notmuch-tree-command-hook'
to `post-command-hook' and that calls `notmuch-show-command-hook',
in the respective show buffer, but of course only if that exists.

Because the tree buffer is created asynchronously, the show buffer
doesn't exist yet by the time the `post-command-hook' is run, so
we have to explicitly run `notmuch-tree-command-hook' once the
show buffer exists.

The show buffer is created when `notmuch-tree-goto-and-insert-msg'
calls `notmuch-tree-show-message-in'.  `notmuch-tree-process-filter'
is what finally brings us here.
---
 emacs/notmuch-tree.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el
index 13007a13..d9265fd5 100644
--- a/emacs/notmuch-tree.el
+++ b/emacs/notmuch-tree.el
@@ -949,7 +949,8 @@ (defun notmuch-tree-goto-and-insert-msg (msg)
       (goto-char (point-max))
       (forward-line -1)
       (when notmuch-tree-open-target
-	(notmuch-tree-show-message-in)))))
+	(notmuch-tree-show-message-in)
+	(notmuch-tree-command-hook)))))
 
 (defun notmuch-tree-insert-tree (tree depth tree-status first last)
   "Insert the message tree TREE at depth DEPTH in the current thread.
-- 
2.30.1
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