addNodeData then findNodeForData results in null

@mcowan wrote:

Given the following code, we get lots of inconsistent behavior:

diagram.model.addNodeData(data)
const node = diagram.findNodeForData(data)
// then we edit the node and also set some fields if the node is within the virtualized viewport

The problem is, the node variable is often null, sometimes it is not null.
How do we make this more reliable so that node is never null in this case.

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