[FIX] web: esc cancels kanban column quick create

The feature was already declared in AbstractQuickCreate, but the
ColumnQuickCreate object did not define a _cancel function.

addons/web/static/src/js/views/kanban/kanban_quick_create.js

@@ -266,6 +266,19 @@ var ColumnQuickCreate = AbstractQuickCreate.extend({
     // Private
     //--------------------------------------------------------------------------
 
+    /**
+     * Triggers up an event to cancel the quick creation
+     *
+     * @override
+     * @private
+     */
+    _cancel: function () {
+        if (!this.folded) {
+            this.folded = true;
+            this.$input.val('');
+            this._update();
+        }
+    },
     /**
      * Triggers up an event to quick create a column with the given value
      *

addons/web/static/tests/views/kanban_tests.js

@@ -1203,7 +1203,7 @@ QUnit.module('Views', {
     });
 
     QUnit.test('quick create record & column in grouped on m2o', function (assert) {
-        assert.expect(2);
+        assert.expect(4);
 
         var kanban = createView({
             View: KanbanView,
@@ -1230,6 +1230,13 @@ QUnit.module('Views', {
 
         assert.strictEqual(kanban.$('.o_kanban_group:last span:contains(new column)').length, 1,
             "the last column should be the newly created one");
+
+        assert.strictEqual(kanban.$('.o_kanban_quick_create:visible button.o_kanban_add').length, 1,
+            "the quick create column should still be opened for mass creation");
+        kanban.$('.o_column_quick_create input').trigger($.Event('keydown', { keyCode: $.ui.keyCode.ESCAPE }));
+        assert.strictEqual(kanban.$('.o_kanban_quick_create:visible button.o_kanban_add').length, 0,
+            "the quick create column should now be closed");
+
         kanban.destroy();
     });