new_editor: stabilize multi-window host lifecycle

new_editor/app/Platform/Win32/EditorWindow.cpp

@@ -183,6 +183,10 @@ void EditorWindow::ClearClosing() {
     m_state->window.closing = false;
 }
 
+void EditorWindow::SetPrimary(bool primary) {
+    m_state->window.primary = primary;
+}
+
 void EditorWindow::SetTrackingMouseLeave(bool trackingMouseLeave) {
     m_inputController->SetTrackingMouseLeave(trackingMouseLeave);
 }
@@ -231,6 +235,15 @@ bool EditorWindow::Initialize(
 }
 
 void EditorWindow::Shutdown() {
+    std::ostringstream trace = {};
+    trace << "EditorWindow::Shutdown begin windowId='" << GetWindowId()
+          << "' hwnd=0x" << std::hex << std::uppercase
+          << reinterpret_cast<std::uintptr_t>(GetHwnd())
+          << std::dec
+          << " primary=" << (IsPrimary() ? 1 : 0)
+          << " closing=" << (IsClosing() ? 1 : 0)
+          << " runtimeReady=" << (m_runtime->IsReady() ? 1 : 0);
+    LogRuntimeTrace("window-close", trace.str());
     ForceReleasePointerCapture();
 
     if (m_runtime->IsReady()) {
@@ -238,6 +251,9 @@ void EditorWindow::Shutdown() {
     }
     m_inputController->ClearPendingEvents();
     m_chromeController->Reset();
+    LogRuntimeTrace(
+        "window-close",
+        "EditorWindow::Shutdown end windowId='" + std::string(GetWindowId()) + "'");
 }
 
 void EditorWindow::ResetInteractionState() {