experimental: if using adaptive/unread mode w/ auto catchup don't calculate offsets because we're only interested in top $limit headlines anyway

classes/api.php

@@ -686,7 +686,8 @@ class API extends Handler {
 				"offset" => $offset,
 				"since_id" => $since_id,
 				"include_children" => $include_nested,
-				"check_first_id" => $check_first_id
+				"check_first_id" => $check_first_id,
+				"api_request" => true
 			);
 
 			$qfh_ret = queryFeedHeadlines($params);

include/functions2.php

@@ -463,6 +463,7 @@
 		$override_vfeed = isset($params["override_vfeed"]) ? $params["override_vfeed"] : false;
 		$start_ts = isset($params["start_ts"]) ? $params["start_ts"] : false;
 		$check_first_id = isset($params["check_first_id"]) ? $params["check_first_id"] : false;
+		$api_request = isset($params["api_request"]) ? $params["api_request"] : false;
 
 		$ext_tables_part = "";
 		$query_strategy_part = "";
@@ -491,6 +492,7 @@
 			}
 
 			$view_query_part = "";
+			$disable_offsets = false;
 
 			if ($view_mode == "adaptive") {
 				if ($search) {
@@ -502,9 +504,10 @@
 					if ($cat_view && $feed > 0 && $include_children)
 						$unread += getCategoryChildrenUnread($feed);
 
-					if ($unread > 0)
+					if ($unread > 0) {
-			        $view_query_part = " unread = true AND ";
+						$view_query_part = " unread = true AND ";
-
+						$disable_offsets = !$api_request && get_pref("CDM_AUTO_CATCHUP");
+					}
 				}
 			}
 
@@ -522,6 +525,7 @@
 
 			if ($view_mode == "unread" && $feed != -6) {
 				$view_query_part = " unread = true AND ";
+				$disable_offsets = !$api_request && get_pref("CDM_AUTO_CATCHUP");
 			}
 
 			if ($limit > 0) {
@@ -762,6 +766,10 @@
 					}
 				}
 
+				if ($disable_offsets) {
+					$offset_query_part = "";
+				}
+
 				$query = "SELECT DISTINCT
 						date_entered,
 						guid,