mu4e: tweak threading for thread-end

mu4e/mu4e-headers.el

@@ -1532,12 +1532,8 @@ If MSG is nil, use message at point."
 (defun mu4e~headers-prev-or-next-thread (backwards)
   "Move point to the top of the next thread.
 If BACKWARDS is non-`nil', move backwards."
-  (interactive "P")
-  (if (mu4e-headers-find-if-next #'mu4e~headers-thread-root-p backwards)
-      (point)
-    (progn
-      (mu4e-message (format "No %s thread found" (if backwards "previous" "next")))
-      nil)))
+  (when (mu4e-headers-find-if-next #'mu4e~headers-thread-root-p backwards)
+      (point)))
 
 (defun mu4e-headers-prev-thread ()
   "Move point to the previous thread."

mu4e/mu4e-thread.el

@@ -127,7 +127,7 @@ There are COUNT hidden and UNREAD messages overall."
   "Test if thread at point is folded."
   (interactive)
   (let* ((thread-beg (mu4e-thread-root))
-         (thread-end (mu4e-thread-next))
+         (thread-end (or (mu4e-thread-next) (point-max)))
          (overlays (overlays-in thread-beg thread-end)))
     (catch 'folded
       (dolist (overlay overlays)
@@ -220,7 +220,7 @@ Reset individual folding states."
   (interactive)
   (unless (eq (line-end-position) (point-max))
     (let* ((thread-beg (mu4e-thread-root))
-           (thread-end (mu4e-thread-next))
+           (thread-end (or (mu4e-thread-next) (point-max)))
            (unread-count 0)
            (fold-beg (save-excursion
                        (goto-char thread-beg)