[xsahil03x]

An open channel page crashed when its channel was hidden or the current user was removed from it. Blocking someone triggers the hide too: the backend hides 1-on-1 channels with the blocked user. The client disposed the Channel on channel.hidden and on the current user's member.removed / notification.removed_from_channel. The page kept the disposed instance and threw on its next read: the header's memberCount when going back, and channel.config when long-pressing a message.

Fixes FLU-1085.

Hiding the open channel from a second client signed in as the same user (sample app, Android):

Before	After	After: message actions	After: back to the list

What changed (stream_chat)

• The channel stays alive. Hiding or removal now only leaves the channel out of StreamChatClient.state.channels, without disposing it. client.state.channels and channelsStream contain exactly what they did before. channel.deleted still disposes.
• One instance per channel. client.channel() and queryChannels look up every live channel, so they return the instance a page already holds instead of creating a second one.
• The way back. watch(), a queryChannels result or channel.visible puts the channel back in client.state.channels. A paginated query() doesn't.
• Accurate state while it's retained. Channel.hidden now follows channel.hidden and channel.visible, and the current user's membership is cleared when they're removed.
• ChannelState.copyWith(membership: null) now clears the membership, as copyWith(draft: null) already did. Leaving membership out still keeps it, and channel updates without a membership still keep the current one.

The iOS, Android and JS SDKs don't dispose a channel on hide or removal either. They update its hidden flag and membership and keep the screen alive.

How it was verified

• Unit tests: 25 new stream_chat tests, through client.handleEvent, client.state.channels and client.channel(). They cover hide, removal, deletion of a hidden channel, the way back, one instance per cid, membership, the hidden flag and the copyWith contract. Each of 19 guards was broken on purpose and a test caught it.
• Suites: stream_chat (2,052) and stream_chat_flutter_core (398) pass. stream_chat_flutter passes apart from the local macOS goldens.
• Emulator (Android, sample app):
  1. With a channel open, I hid it from a second client signed in as the same user.
  2. Long-pressing a message still opens the message actions.
  3. Going back doesn't crash, and the channel is gone from the list.
  4. Showing it again puts it back in the list, and it opens normally.
• e2e: these tests are un-skipped and run in this PR's E2E workflow:
  • "app does not crash when the user goes back after being removed from the open channel";
  • "user blocks the participant in a direct message channel";
  • "direct message channel disappears when the user blocks the participant".

🤖 Generated with Claude Code

https://claude.ai/code/session_012vTgFwqhUc2wKCWrw635yC

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