6637f2dbb7
If a user sends a message while the latest batch of messages are being fetched, the new message recieved from `server_events` gets displayed temporarily out of order (just after the the current batch of messages) for the current narrow. We could just discard the new message events if we havent recieved the last message i.e. when `found_newest` = False, since we would recieve them on furthur fetching of that narrow. But this would create another bug where the new messages sent while fetching the last batch of messages would not get rendered. Because, `found_newest` = True and we would no longer fetch messages for that narrow, thus the new messages would not get fetched and are also discarded from the events codepath. Thus to resolve both these bugs we use the following approach: * We do not add the new batch of messages for the current narrow while `has_found_newest` = False. * We store the latest message id which should be displayed at the bottom of the narrow in `fetch_status`. * Ideally `expected_max_message_id`'s value should be equal to the last item's id in `MessageListData`. * So the messages received while `has_found_newest` = False, will be fetched later and also the `expected_max_message_id` value gets updated. * And after fetching the last batch where `has_found_newest` = True, we would again fetch messages if the `expected_max_message_id` is greater than the last message's id found on fetching by refusing to update the server provided `has_found_newest` = True in `fetch_status`. Another benefit of not discarding the events is that the message gets processed not rendered i.e. we still get desktop notifications and unread count updates. Fixes #14017 |
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README.md
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 500 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
Getting started
Click on the appropriate link below. If nothing seems to apply, join us on the Zulip community server and tell us what's up!
You might be interested in:
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Contributing code. Check out our guide for new contributors to get started. Zulip prides itself on maintaining a clean and well-tested codebase, and a stock of hundreds of beginner-friendly issues.
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Contributing non-code. Report an issue, translate Zulip into your language, write for the Zulip blog, or give us feedback. We would love to hear from you, even if you're just trying the product out.
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Supporting Zulip. Advocate for your organization to use Zulip, write a review in the mobile app stores, or upvote Zulip on product comparison sites.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading Zulip for open source, Zulip for companies, or Zulip for working groups and part time communities.
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Running a Zulip server. Use a preconfigured Digital Ocean droplet, install Zulip directly, or use Zulip's experimental Docker image. Commercial support is available; see https://zulip.com/plans for details.
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Using Zulip without setting up a server. https://zulip.com offers free and commercial hosting, including providing our paid plan for free to fellow open source projects.
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Participating in outreach programs like Google Summer of Code.
You may also be interested in reading our blog or following us on twitter. Zulip is distributed under the Apache 2.0 license.