fix: introduce a queue into update state machine

[iboughtbed]

Summary by cubic

Added a queue to the update-event state machine to serialize updates and capture START events fired during prompts or an in-flight mutation. This prevents dropped updates and race conditions during rapid edits.

• Bug Fixes
  • Added queue to context with enqueueItem and processNextInQueue actions.
  • START is now accepted in askRecurringScope, askNotifyAttendee, and mutate.
  • Introduced checkQueue state to drain the queue after mutate/rollback or when no item is present.
  • clear now resets the queue; added clearQueueOptimisticActions to clean leftover optimistic actions.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
analog	Ready	Preview	Comment	Sep 8, 2025 4:08pm

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[cubic-dev-ai]

1 issue found across 1 file

_{React with 👍 or 👎 to teach cubic. Mention @cubic-dev-ai to give feedback, ask questions, or re-run the review.}

[cubic-dev-ai]

The rollback state clears the entire update queue (actions: "clear") if a single update fails, but it does not clean up the optimistic UI changes for the discarded queued items. The clearQueueOptimisticActions function was added to handle this cleanup, but it is never called, leading to a leaked UI state where the application shows updates that have been silently dropped.

Prompt for AI agents

Address the following comment on apps/web/src/components/calendar/flows/update-event/update-queue.ts at line 182:

<comment>The `rollback` state clears the entire update queue (`actions: &quot;clear&quot;`) if a single update fails, but it does not clean up the optimistic UI changes for the discarded queued items. The `clearQueueOptimisticActions` function was added to handle this cleanup, but it is never called, leading to a leaked UI state where the application shows updates that have been silently dropped.</comment>

<file context>
@@ -137,32 +153,44 @@ export function createUpdateQueueMachine({
       rollback: {
         entry: &quot;removeOptimisticAction&quot;,
-        always: { target: &quot;idle&quot;, actions: &quot;clear&quot; },
+        always: { target: &quot;checkQueue&quot;, actions: &quot;clear&quot; },
       },
 
</file context>