Sybren A. Stüvel c9500b85c2 OAPI: add SocketIOLastRenderedUpdate for broadcasting last-rendered imgs
`SocketIOLastRenderedUpdate` objects are meant to be broadcast to SocketIO
clients (i.e. the web interface). They are sent to the job-specific room,
just like task updates.
2022-06-30 18:32:42 +02:00
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