Trace desktop stream stalls across playback and preview UI

tools/chatgui/src/mainwindow.cpp

@@ -47,6 +47,7 @@ extern "C" {
 #include "../transport/gui_bridge.h"
 #include <QSplitter>
 #include <QCloseEvent>
+#include <QElapsedTimer>
 #include <QApplication>
 #include <QScreen>
 #include <QClipboard>
@@ -664,6 +665,7 @@ void MainWindow::setupBridgeCallbacks() {
 
 /* Один publisher обслуживает шапку и свою плитку; окно управления не владеет сеткой и её readers. */
 void MainWindow::showStreamPublisher(quint64 group, StreamGridWindow* returnTo) {
+    QElapsedTimer elapsed; elapsed.start();
     if (!m_streamPublisher) {
         m_streamPublisher = new StreamPublishEngine(this);
         connect(m_streamPublisher, &StreamPublishEngine::stateChanged, this, [this](const QString& state) {
@@ -674,9 +676,12 @@ void MainWindow::showStreamPublisher(quint64 group, StreamGridWindow* returnTo)
             if (m_streamGrid) m_streamGrid->setLocalPreview(m_streamPublisher->group(), frame);
         });
     }
+    qint64 engineUs = elapsed.nsecsElapsed() / 1000;
     if (m_streamPublishWindow) delete m_streamPublishWindow.data();
+    qint64 removedUs = elapsed.nsecsElapsed() / 1000;
     m_streamPublishWindow = new StreamPublishWindow(m_streamPublisher, m_streamPublisher->active() ? m_streamPublisher->group() : group,
         this, m_db ? m_db->getUiState("stream_capture_settings") : QString());
+    qint64 constructedUs = elapsed.nsecsElapsed() / 1000;
     connect(m_streamPublishWindow, &StreamPublishWindow::settingsChanged, this,
         [](const QString& settings) { postUiStateKv("stream_capture_settings", settings); });
     if (returnTo) connect(m_streamPublishWindow, &StreamPublishWindow::closed, returnTo, [returnTo] {
@@ -688,6 +693,12 @@ void MainWindow::showStreamPublisher(quint64 group, StreamGridWindow* returnTo)
     DEBUG_INFO(DEBUG_CATEGORY_STREAM, "desktop publisher controls opened group=%llx return_to_grid=%d",
         (unsigned long long)group, returnTo != nullptr);
     m_streamPublishWindow->show(); m_streamPublishWindow->raise(); m_streamPublishWindow->activateWindow();
+    qint64 shownUs = elapsed.nsecsElapsed() / 1000;
+    DEBUG_DEBUG(DEBUG_CATEGORY_DEBUG,
+        "desktop publisher UI group=%llx active=%d return_to_grid=%d engine_us=%lld remove_us=%lld construct_us=%lld show_us=%lld total_us=%lld",
+        (unsigned long long)group, m_streamPublisher->active(), returnTo != nullptr, (long long)engineUs,
+        (long long)(removedUs - engineUs), (long long)(constructedUs - removedUs),
+        (long long)(shownUs - constructedUs), (long long)shownUs);
 }
 
 void MainWindow::setupConnects() {