[PATCH v3 2/4] emacs: notmuch-show: refresh all windows showing a buffer

[Ioan-Adrian Ratiu <adi@adirat.com>]

This updates all windows displaying a notmuch-show buffer when the
buffer refresh function is called.

Each window displaying a notmuch-show buffer has its own currently
displayed messaged based on the (point) location. Store the state
of all displayed windows when refreshing a notmuch-show buffer and
re-apply the current shown message for all windows.

Signed-off-by: Ioan-Adrian Ratiu <adi@adirat.com>
---
 emacs/notmuch-show.el | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index f2487ab..ac7eb77 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1317,8 +1317,13 @@ If no messages match the query return NIL."
 
 This includes:
  - the list of open messages,
- - the current message."
-  (list (notmuch-show-get-message-id) (notmuch-show-get-message-ids-for-open-messages)))
+ - the combination of current message id with/for each visible window."
+  (let* ((win-list (get-buffer-window-list (current-buffer) nil t))
+	 (win-id-combo (mapcar (lambda (win)
+				 (with-selected-window win
+				   (list win (notmuch-show-get-message-id))))
+			       win-list)))
+    (list win-id-combo (notmuch-show-get-message-ids-for-open-messages))))
 
 (defun notmuch-show-get-query ()
   "Return the current query in this show buffer"
@@ -1345,8 +1350,8 @@ This includes:
 This includes:
  - opening the messages previously opened,
  - closing all other messages,
- - moving to the correct current message."
-  (let ((current (car state))
+ - moving to the correct current message in every displayed window."
+  (let ((win-msg-alist (car state))
 	(open (cadr state)))
 
     ;; Open those that were open.
@@ -1355,8 +1360,10 @@ This includes:
 					   (member (notmuch-show-get-message-id) open))
 	  until (not (notmuch-show-goto-message-next)))
 
-    ;; Go to the previously open message.
-    (notmuch-show-goto-message current)))
+    (dolist (win-msg-pair win-msg-alist)
+      (with-selected-window (car win-msg-pair)
+	;; Go to the previously open message in this window
+	(notmuch-show-goto-message (cadr win-msg-pair))))))
 
 (defun notmuch-show-refresh-view (&optional reset-state)
   "Refresh the current view.
-- 
2.10.0