DTD startup failure

[helin24]

This seems to be occurring often on startup, but not blocking things that connect to DTD:

2026-06-10 15:19:00 com.jetbrains.lang.dart.ide.toolingDaemon.DartToolingDaemonService [INFO   ] Starting Dart Tooling Daemon, sdk 3.13.0-177.0.dev
  
2026-06-10 15:19:00 com.jetbrains.lang.dart.dtd.DTDProcess [INFO   ] DTD process terminated, exit code: 137 

And then it causes:

2026-06-10 15:19:24 io.flutter.widgetpreview.WidgetPreviewPanel [SEVERE ] DTD service is not available after 30 seconds. 
java.util.concurrent.ExecutionException: java.lang.Exception: Timed out waiting for DTD websocket to start
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2096)
	at io.flutter.widgetpreview.WidgetPreviewPanel.getDtdUri(WidgetPreviewPanel.java:193)
	at io.flutter.widgetpreview.WidgetPreviewPanel.lambda$startWidgetPreview$2(WidgetPreviewPanel.java:143)
	at com.intellij.openapi.application.impl.ApplicationImpl$4.run(ApplicationImpl.java:326)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at com.intellij.util.concurrency.ContextCallable.lambda$call$1(ContextCallable.java:86)
	at com.intellij.util.concurrency.ContextCallable.call(ContextCallable.java:95)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
	at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:167)
	at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:173)
	at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:167)
	at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:735)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:732)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:732)
	at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.Exception: Timed out waiting for DTD websocket to start
	at io.flutter.dart.DtdUtils.lambda$readyDtdService$1(DtdUtils.java:39)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
	at com.intellij.util.concurrency.ContextCallable.lambda$call$1(ContextCallable.java:86)
	at com.intellij.util.concurrency.ContextCallable.call(ContextCallable.java:95)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at com.intellij.util.concurrency.SchedulingWrapper$MyScheduledFutureTask.run(SchedulingWrapper.java:277)
	... 7 more

Maybe we have a restart later or something that causes DTD to be available again at the point when I'm opening tool windows.