[evolution] Bug 710761 - Mail message list filtered without UI indication

[Milan Crha <mcrha src gnome org>]

commit 5228f1f80f67e3f7391c6c020ee1334f1ab84f6c
Author: Milan Crha <mcrha redhat com>
Date:   Wed Nov 11 22:34:15 2015 +0100

    Bug 710761 - Mail message list filtered without UI indication

 mail/message-list.c |   23 ++++++++++++++++-------
 1 files changed, 16 insertions(+), 7 deletions(-)
---
diff --git a/mail/message-list.c b/mail/message-list.c
index eb6c9c3..ff234e4 100644
--- a/mail/message-list.c
+++ b/mail/message-list.c
@@ -467,6 +467,7 @@ regen_data_new (MessageList *message_list,
        regen_data->ref_count = 1;
        regen_data->activity = g_object_ref (activity);
        regen_data->message_list = g_object_ref (message_list);
+       regen_data->folder = message_list_ref_folder (message_list);
        regen_data->last_row = -1;
 
        if (message_list->just_set_folder)
@@ -5370,14 +5371,23 @@ void
 message_list_set_search (MessageList *message_list,
                          const gchar *search)
 {
+       RegenData *current_regen_data;
+
        g_return_if_fail (IS_MESSAGE_LIST (message_list));
 
-       if (search == NULL || search[0] == '\0')
+       current_regen_data = message_list_ref_regen_data (message_list);
+
+       if (!current_regen_data && (search == NULL || search[0] == '\0'))
                if (message_list->search == NULL || message_list->search[0] == '\0')
                        return;
 
-       if (search != NULL && message_list->search != NULL && strcmp (search, message_list->search) == 0)
+       if (!current_regen_data && search != NULL && message_list->search != NULL &&
+           strcmp (search, message_list->search) == 0) {
                return;
+       }
+
+       if (current_regen_data)
+               regen_data_unref (current_regen_data);
 
        /* Invalidate the thread tree. */
        message_list_set_thread_tree (message_list, NULL);
@@ -6124,8 +6134,6 @@ message_list_regen_idle_cb (gpointer user_data)
 
        /* Capture MessageList state to use for this regen. */
 
-       regen_data->folder =
-               message_list_ref_folder (message_list);
        regen_data->group_by_threads =
                message_list_get_group_by_threads (message_list);
        regen_data->thread_subject =
@@ -6220,14 +6228,15 @@ mail_regen_list (MessageList *message_list,
        if (!search) {
                old_regen_data = message_list_ref_regen_data (message_list);
 
-               if (old_regen_data) {
+               if (old_regen_data && old_regen_data->folder == message_list->priv->folder) {
                        tmp_search_copy = g_strdup (old_regen_data->search);
                        search = tmp_search_copy;
-
-                       regen_data_unref (old_regen_data);
                } else {
                        search = message_list->search;
                }
+
+               if (old_regen_data)
+                       regen_data_unref (old_regen_data);
        } else if (search && !*search) {
                search = NULL;
        }