[fix] reconcile Windows autostart and preserve applied settings

apps/desktop/src/platform/windows/service/autostart_state.cpp

@@ -0,0 +1,53 @@
+#include "platform/windows/service/autostart_control.h"
+
+#include "platform/autostart_backend.h"
+#include "platform/windows/autostart_task.h"
+#include "platform/windows/executable_path.h"
+#include "service_host.h"
+#include "shared_identity.h"
+#include "unattended_config.h"
+
+namespace crossdesk {
+namespace {
+
+std::wstring ServiceExecutable() {
+  return platform::SiblingExecutablePath(L"crossdesk_service.exe").wstring();
+}
+
+bool SharedHostArmed() {
+  return SupportsServiceAutostart() && IsUnattendedEnabled() &&
+         IsSharedIdentityServiceConfigured() && SharedHostIdentity::Configured();
+}
+
+}  // namespace
+
+bool IsServiceAutostartEnabled() {
+  DWORD start_type = SERVICE_DEMAND_START;
+  return SharedHostArmed() &&
+         QueryCrossDeskServiceRegistration(ServiceExecutable(), nullptr, &start_type) !=
+             ServiceRegistrationState::query_failed &&
+         start_type == SERVICE_AUTO_START;
+}
+
+bool ServiceAutostartMatches(bool enabled) {
+  DWORD start_type = SERVICE_DEMAND_START;
+  if (!enabled) {
+    bool unattended = false;
+    if (!QueryUnattendedEnabled(unattended) || unattended) return false;
+    const auto registration =
+        QueryCrossDeskServiceRegistration(ServiceExecutable(), nullptr, &start_type);
+    if (registration == ServiceRegistrationState::query_failed) return false;
+    if (registration != ServiceRegistrationState::not_installed &&
+        start_type != SERVICE_DEMAND_START && start_type != SERVICE_DISABLED)
+      return false;
+    // The flag can already be off after a partially failed disable. Only skip
+    // the retry after checking the same registrations that cleanup removes.
+    return platform::IsInstalledAutostartAbsent("CrossDesk");
+  }
+  return SharedHostArmed() &&
+         QueryCrossDeskServiceRegistration(ServiceExecutable(), nullptr, &start_type) ==
+             ServiceRegistrationState::current &&
+         start_type == SERVICE_AUTO_START && platform::IsAutostartEnabled("CrossDesk");
+}
+
+}  // namespace crossdesk