Unable to send messages after sending five messages

[elisealix22]

This was reproducible by many on the dev network.

• Open a conversation
• Send 6 messages
• Notice after 5 nothing shows up

Reloading the page resolves the issue.

[neekolas]

Wow. That's a great find.

[snormore]

Looks like it makes a bunch of subscribe requests on every new message. It even looks like the number of those requests increases non/super-linearly with each, with hundreds of them there after just a few requests.