[evolution-data-server/gnome-3-32] [IMAPx] Prefer local search in folders fully synchronized for offline

[Milan Crha <mcrha src gnome org>]

commit 5f494d4846d2aa673812e10364baaf1afc51a285
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jun 12 13:49:12 2019 +0200

    [IMAPx] Prefer local search in folders fully synchronized for offline
    
    When a folder is fully synchronized for offline, any search can be done
    with local data, without issuing SEARCH command on the server.

 src/camel/providers/imapx/camel-imapx-search.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)
---
diff --git a/src/camel/providers/imapx/camel-imapx-search.c b/src/camel/providers/imapx/camel-imapx-search.c
index b7b01c081..b687a37b6 100644
--- a/src/camel/providers/imapx/camel-imapx-search.c
+++ b/src/camel/providers/imapx/camel-imapx-search.c
@@ -701,7 +701,8 @@ camel_imapx_search_new (CamelIMAPXStore *imapx_store)
  * @search: a #CamelIMAPXSearch
  *
  * Returns a #CamelIMAPXStore to use for server-side searches,
- * or %NULL when the store is offline.
+ * or %NULL when the store is offline or when the current folder
+ * is synchronized for offline use.
  *
  * The returned #CamelIMAPXStore is referenced for thread-safety and
  * must be unreferenced with g_object_unref() when finished with it.
@@ -719,8 +720,27 @@ camel_imapx_search_ref_store (CamelIMAPXSearch *search)
 
        imapx_store = g_weak_ref_get (&search->priv->imapx_store);
 
-       if (imapx_store && !camel_offline_store_get_online (CAMEL_OFFLINE_STORE (imapx_store)))
-               g_clear_object (&imapx_store);
+       if (imapx_store) {
+               if (!camel_offline_store_get_online (CAMEL_OFFLINE_STORE (imapx_store))) {
+                       g_clear_object (&imapx_store);
+               } else {
+                       CamelFolder *folder;
+
+                       folder = camel_folder_search_get_folder (CAMEL_FOLDER_SEARCH (search));
+
+                       if (CAMEL_IS_OFFLINE_FOLDER (folder) && camel_offline_folder_can_downsync 
(CAMEL_OFFLINE_FOLDER (folder))) {
+                               CamelSettings *settings;
+
+                               settings = camel_service_ref_settings (CAMEL_SERVICE (imapx_store));
+
+                               /* Downloads everything for the offline usage, thus search in the local cache 
only */
+                               if (settings && !camel_offline_settings_get_limit_by_age 
(CAMEL_OFFLINE_SETTINGS (settings)))
+                                       g_clear_object (&imapx_store);
+
+                               g_clear_object (&settings);
+                       }
+               }
+       }
 
        return imapx_store;
 }