Support for combined shards

config/vufind/combined.ini

@@ -28,6 +28,8 @@
 ;                           will be suppressed (default).
 ; filter = One or more filters to apply to search results displayed in the column.
 ;          Use multiple "filter[] = ..." lines if multiple filters are needed.
+; shard = Limit results to one or more shards (use names from searches.ini, not
+;         URLs). Use multiple "shard[] = ..." lines if multiple shards are needed.
 ;
 ; All display text is subject to translation and may be added to the language
 ; .ini files.

module/VuFind/src/VuFind/Controller/CombinedController.php

@@ -265,6 +265,10 @@ class CombinedController extends AbstractSearch
         $query->filter = isset($settings['filter'])
             ? (array)$settings['filter'] : null;
 
+        // Apply shards, if any:
+        $query->shard = isset($settings['shard'])
+            ? (array)$settings['shard'] : null;
+
         // Reset override to avoid bleed-over from one section to the next!
         $query->recommendOverride = false;