Add message_list.remove_and_rerender

(imported from commit 68da0ad74f797fae3257577bbf415fd1fe9488a6)

static/js/message_list.js

@@ -406,6 +406,32 @@ MessageList.prototype = {
         this.view.rerender_the_whole_thing();
     },
 
+    remove_and_rerender: function MessageList_remove_and_rerender(messages) {
+        var self = this;
+        _.each(messages, function (message) {
+            var stored_message = self._hash[message.id];
+            if (stored_message !== undefined) {
+                delete self._hash[stored_message];
+            }
+        });
+
+        var msg_ids_to_remove = {};
+        _.each(messages, function (message) {
+            msg_ids_to_remove[message.id] = true;
+        });
+        this._items = _.filter(this._items, function (message) {
+            return !msg_ids_to_remove.hasOwnProperty(message.id);
+        });
+        if (this.muting_enabled) {
+            this._all_items = _.filter(this._all_items, function (message) {
+                return !msg_ids_to_remove.hasOwnProperty(message.id);
+            });
+        }
+
+        this.view.rerender_the_whole_thing();
+        this.select_id(this.selected_id(), {use_closest: true, empty_ok: true});
+    },
+
     show_edit_message: function MessageList_show_edit_message(row, edit_obj) {
         row.find(".message_edit_form").empty().append(edit_obj.form);
         row.find(".message_content").hide();

zerver/tests/frontend/node/message_list.js

@@ -96,8 +96,14 @@ var MessageList = require('js/message_list');
     list.append(new_messages, true);
     assert.equal(list.last().id, 90);
 
-
     list.view.clear_table = function () {};
+
+    list.remove_and_rerender([{id: 60}]);
+    var removed = list.all().filter(function (msg) {
+        return msg.id !== 60;
+    });
+    assert.deepEqual(list.all(), removed);
+
     list.clear();
     assert.deepEqual(list.all(), []);