TODO: Eventually remove this document upgrade code Kick off the one-time pre-pass converting legacy bounding-box gradients to absolute space, or no-op if already running. Returns false when the render should proceed normally instead: the pass already ran this session, so any entries still pending are unmeasurable ones kept to retry on the next open.
(&mut self, document: &mut DocumentMessageHandler, document_id: DocumentId, resolution: UVec2, scale: f64, responses: &mut VecDeque<Message>)
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