add hotkey for toggling VFEED_GROUP_BY_FEED preference

include/functions2.php

@@ -89,6 +89,7 @@
 				"feed_edit" => __("Edit feed"),
 				"feed_catchup" => __("Mark as read"),
 				"feed_reverse" => __("Reverse headlines"),
+				"feed_toggle_vgroup" => __("Toggle headline grouping"),
 				"feed_debug_update" => __("Debug feed update"),
 				"feed_debug_viewfeed" => __("Debug viewfeed()"),
 				"catchup_all" => __("Mark all feeds as read"),
@@ -158,6 +159,7 @@
 				"f e" => "feed_edit",
 				"f q" => "feed_catchup",
 				"f x" => "feed_reverse",
+				"f g" => "feed_toggle_vgroup",
 				"f *d" => "feed_debug_update",
 				"f *g" => "feed_debug_viewfeed",
 				"f *c" => "toggle_combined_mode",

js/tt-rss.js

@@ -441,6 +441,16 @@ function init() {
 		hotkey_actions["feed_reverse"] = function() {
 				reverseHeadlineOrder();
 		};
+		hotkey_actions["feed_toggle_vgroup"] = function() {
+			var query_str = "?op=rpc&method=togglepref&key=VFEED_GROUP_BY_FEED";
+
+			new Ajax.Request("backend.php", {
+				parameters: query_str,
+				onComplete: function(transport) {
+					viewCurrentFeed();
+			} });
+
+		};
 		hotkey_actions["catchup_all"] = function() {
 				catchupAllFeeds();
 		};