add cached dayHeader date reset on clean

DevExpress · Oct 15, 2024 · ea0f08c · ea0f08c
1 parent 346f365
commit ea0f08c
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diff --git a/packages/devextreme/js/__internal/ui/chat/messagelist.ts b/packages/devextreme/js/__internal/ui/chat/messagelist.ts
@@ -373,6 +373,7 @@ class MessageList extends Widget<Properties> {
 
   _clean(): void {
     this._messageGroups = [];
+    this._lastMessageDate = null;
 
     super._clean();
   }

diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageList.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageList.tests.js
@@ -346,6 +346,27 @@ QUnit.module('MessageList', moduleConfig, () => {
 
             assert.strictEqual($dayHeaders.length, 1, 'only one day header was added');
         });
+
+        QUnit.test('Day header should not dissapear after component invalidate', function(assert) {
+            const items = [{
+                timestamp: new Date('11.10.2024'),
+                text: 'ABC',
+            }];
+
+            this.reinit({
+                items,
+            });
+
+            let $dayHeaders = this.getDayHeaders();
+
+            assert.strictEqual($dayHeaders.length, 1, 'day header was aaded');
+
+            this.instance.option({ items });
+
+            $dayHeaders = this.getDayHeaders();
+
+            assert.strictEqual($dayHeaders.length, 1, 'day header is not removed after invalidate');
+        });
     });
 
     QUnit.module('MessageGroup integration', () => {