It's very hard to repro but under specific circumstances I suspect it was possible for this sequence to happen:
- set message TEXT
- cooking starts
- set message COOKED through another mean (like a message bus)
- the cooking started sooner finished and erases the cooked set at the step before causing the message to have the incorrect cooked
This regression happened in bd5c5c4b5f and is due to `message_bus_targets = calculate_publish_targets(chat_channel, chat_message)` expecting a `chat_channel` which was only defined after.
Example exception in logs:
```
Job exception: undefined local variable or method `chat_channel' for Chat::Publisher:Module
/var/www/discourse/plugins/chat/app/services/chat/publisher.rb:91:in `publish_processed!'
/var/www/discourse/plugins/chat/app/jobs/regular/chat/process_message.rb:21:in `block in execute'
/var/www/discourse/lib/distributed_mutex.rb:53:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:49:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:49:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:34:in `synchronize'
/var/www/discourse/plugins/chat/app/jobs/regular/chat/process_message.rb:7:in `execute'
/var/www/discourse/app/jobs/base.rb:249:in `block (2 levels) in perform'
```
This commit also:
- adds a spec to ensure oneboxing is not regressing anymore
- increment the version on message processed to ensure callbacks are correctly ran
Note we should also have more tests in `Chat::Publisher`, this will be done when we move it to a proper service.
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