Verify caption updates preserve continuous H264 and Opus playback

tools/chatgui/tests/test_stream_view.cpp

@@ -599,7 +599,9 @@ private slots:
         for (auto* label : remote->findChildren<QLabel*>()) if (label->text() == remoteName) remoteTitle = label;
         QVERIFY(localTitle); QVERIFY(remoteTitle);
         QPointer<QVideoWidget> preview = local->findChild<QVideoWidget*>(); QVERIFY(preview);
-        QVideoFrame frame(QImage(16, 16, QImage::Format_RGB32)); frame.setStartTime(123000);
+        QVideoFrame frame(QVideoFrameFormat(QSize(16, 16), QVideoFrameFormat::Format_BGRA8888));
+        QVERIFY(frame.map(QVideoFrame::WriteOnly)); memset(frame.bits(0), 0xff, frame.mappedBytes(0)); frame.unmap();
+        frame.setStartTime(123000);
         grid.setLocalPreview(group, QVariant::fromValue(frame));
         QPointer<VideoRenderWidget> video = remote->findChild<VideoRenderWidget*>(); QVERIFY(video);
         auto* volume = remote->findChild<QSlider*>(); QVERIFY(volume); volume->setValue(37);
@@ -798,7 +800,18 @@ private slots:
 #ifdef TEST_NULL_AUDIO
         uint64_t gapsBefore = silenceGaps.load();
 #endif
-        int beforeSteady = shown.count(); QTest::qWait(1500);
+        int beforeSteady = shown.count();
+        QPointer<VideoRenderWidget> render = window.findChild<VideoRenderWidget*>(); QVERIFY(render);
+        const QString renamed = QString::fromUtf8("Переименован во время эфира 🎬");
+        window.setSourceName(renamed);
+        QCOMPARE(window.windowTitle(), QString("Live stream: %1").arg(renamed));
+        bool renamedCaption = false;
+        for (auto* label : window.findChildren<QLabel*>()) renamedCaption |= label->text() == renamed && label->toolTip() == renamed;
+        QVERIFY(renamedCaption);
+        QTest::qWait(1500);
+        QVERIFY(render); QCOMPARE(window.findChild<VideoRenderWidget*>(), render.data());
+        stream_info renamedInfo{}; QCOMPARE(stream_get_info(publisher, &renamedInfo), STREAM_OK);
+        QCOMPARE(renamedInfo.owners, 2u); QCOMPARE(renamedInfo.descriptor.source_epoch, epoch);
         QVERIFY2(shown.count() >= beforeSteady + 30, "30fps video must keep advancing with 200ms physical audio latency");
 #ifdef TEST_NULL_AUDIO
         QCOMPARE(silenceGaps.load(), gapsBefore);