[evolution-data-server/gnome-3-8] Bug #704181 - Froze while filtering messages

[Milan Crha <mcrha src gnome org>]

commit 8bbf4596b18bdf241fbd36b333d80492932424c8
Author: Milan Crha <mcrha redhat com>
Date:   Thu Jul 18 18:54:37 2013 +0200

    Bug #704181 - Froze while filtering messages

 camel/camel-folder.c |   25 ++++++++++++++++++++++---
 1 files changed, 22 insertions(+), 3 deletions(-)
---
diff --git a/camel/camel-folder.c b/camel/camel-folder.c
index ce257c6..145d441 100644
--- a/camel/camel-folder.c
+++ b/camel/camel-folder.c
@@ -239,9 +239,13 @@ folder_emit_renamed_cb (gpointer user_data)
        return FALSE;
 }
 
-static void
-folder_filter_data_free (FolderFilterData *data)
+static gpointer
+folder_filter_data_free_thread (gpointer user_data)
 {
+       FolderFilterData *data = user_data;
+
+       g_return_val_if_fail (data != NULL, NULL);
+
        if (data->driver != NULL)
                g_object_unref (data->driver);
        if (data->recents != NULL)
@@ -258,6 +262,21 @@ folder_filter_data_free (FolderFilterData *data)
        g_object_unref (data->folder);
 
        g_slice_free (FolderFilterData, data);
+
+       return NULL;
+}
+
+static void
+prepare_folder_filter_data_free (FolderFilterData *data)
+{
+       GThread *thread;
+
+       /* Do the actual free in a dedicated thread, because the driver or
+          folder unref can do network/blocking I/O operations, but this
+          function is called in the main (UI) thread.
+       */
+       thread = g_thread_new (NULL, folder_filter_data_free_thread, data);
+       g_thread_unref (thread);
 }
 
 static void
@@ -1753,7 +1772,7 @@ folder_changed (CamelFolder *folder,
 
                camel_session_submit_job (
                        session, (CamelSessionCallback) folder_filter,
-                       data, (GDestroyNotify) folder_filter_data_free);
+                       data, (GDestroyNotify) prepare_folder_filter_data_free);
 
                g_signal_stop_emission (folder, signals[CHANGED], 0);
        }