Throttle kanban refresh on remote changes

www/kanban/inner.js

@@ -133,6 +133,12 @@ define([
         return tags;
     };
 
+    var updateBoards = Util.throttle(function (framework, kanban, boards) {
+        kanban.setBoards(Util.clone(boards));
+        kanban.inEditMode = false;
+        addEditItemButton(framework, kanban);
+    }, 500);
+
     var addEditItemButton = function () {};
     var onRemoteChange = Util.mkEvent();
     var editModal;
@@ -146,10 +152,9 @@ define([
         var isBoard, id;
         var offline = false;
 
-        var update = Util.throttle(function () {
-            kanban.setBoards(kanban.options.boards);
-            addEditItemButton(framework, kanban);
-        }, 400);
+        var update = function () {
+            updateBoards(framework, kanban, kanban.options.boards);
+        };
 
         var commit = function () {
             framework.localChange();
@@ -830,7 +835,8 @@ define([
             openLink: openLink,
             getTags: getExistingTags,
             cursors: remoteCursors,
-            boards: boards
+            boards: boards,
+            _boards: Util.clone(boards),
         });
 
         framework._.cpNfInner.metadataMgr.onChange(function () {
@@ -841,7 +847,7 @@ define([
             // If the rendering has changed, update the value and redraw
             kanban.options.tagsAnd = tagsAnd;
             _tagsAnd = tagsAnd;
-            kanban.setBoards(kanban.options.boards);
+            updateBoards(kanban.options.boards);
         });
 
         if (migrated) { framework.localChange(); }
@@ -1166,9 +1172,8 @@ define([
             if (Sortify(currentContent) !== Sortify(remoteContent)) {
                 var cursor = getCursor();
                 verbose("Content is different.. Applying content");
-                kanban.setBoards(remoteContent);
-                kanban.inEditMode = false;
-                addEditItemButton(framework, kanban);
+                kanban.options.boards = remoteContent;
+                updateBoards(framework, kanban, remoteContent);
                 restoreCursor(cursor);
                 onRemoteChange.fire();
             }

www/kanban/jkanban_cp.js

@@ -32,7 +32,8 @@ define([
                 data: {},
                 items: {},
                 list: []
-            },
+            }, // The realtime kanban
+            _boards: {}, // The displayed kanban. We need to remember the old columns when we redraw
             getAvatar: function () {},
             openLink: function () {},
             getTags: function () {},
@@ -707,21 +708,29 @@ define([
         };
         this.addBoard = function (board) {
             if (!board || !board.id) { return; }
+            // We need to store all the columns in _boards too because it's used to
+            // remember what columns were already displayed when we redraw (in order to
+            // preserve their scroll value)
             var boards = self.options.boards;
             boards.data = boards.data || {};
             boards.list = boards.list || [];
+            var _boards = self.options._boards;
+            _boards.data = _boards.data || {};
+            _boards.list = _boards.list || [];
             // If it already there, abort
             boards.data[board.id] = board;
+            _boards.data[board.id] = board;
             if (boards.list.indexOf(board.id) !== -1) { return; }
 
             boards.list.push(board.id);
+            _boards.list.push(board.id);
             var boardNode = getBoardNode(board);
             self.container.appendChild(boardNode);
         };
 
         this.addBoards = function() {
             //for on all the boards
-            var boards = self.options.boards;
+            var boards = self.options._boards;
             boards.list = boards.list || [];
             boards.data = boards.data || {};
             var toRemove = [];
@@ -759,10 +768,10 @@ define([
             var $el = $(self.element);
             var scrollLeft = $el.scrollLeft();
             // Get existing boards list
-            var list = Util.clone(this.options.boards.list);
+            var list = Util.clone(this.options._boards.list);
 
             // Update memory
-            this.options.boards = boards;
+            this.options._boards = boards;
 
             // If the tab is not focused but a handler already exists: abort
             if (!Visible.currently() && onVisibleHandler) { return; }
@@ -779,7 +788,7 @@ define([
                 self.addBoards();
                 self.options.refresh();
                 // Preserve scroll
-                self.options.boards.list.forEach(function (id) {
+                self.options._boards.list.forEach(function (id) {
                     if (!scroll[id]) { return; }
                     $('.kanban-board[data-id="'+id+'"] .kanban-drag').scrollTop(scroll[id]);
                 });