Point Annotations disappearing after merge/split

[nkemnitz]

Tracers reported an issue with segmentation-linked local point annotations that are disappearing after merges and splits, and occasionally reappearing for unknown reasons. Example link: https://nkem-multicut-dot-neuromancer-seung-import.appspot.com/?json_url=https://www.dynamicannotationframework.com/nglstate/5689792285114368

[nkemnitz]

Whenever a point annotation is added by a user, it gets linked to a ChunkedGraph Node ID:

• If in 2D and no neuron at those coordinates is selected: Annotation gets linked to a Supervoxel ID
• If in 2D and neuron at those coordinates is selected: Annotation gets linked to a Root ID
  • this Root ID might refer to an old state for this neuron, depending on when the segment was selected (esp. when links get shared)
• If in 3D: Annotation gets linked to the ChunkedGraph Node ID at the picked coordinates: Can be anything between Supervoxel ID and Root ID
  • this ChunkedGraph Node ID might refer to an old state for this neuron, depending on when the segment was selected (esp. when links get shared)

Issue 1: Supervoxel IDs <-> Root ID mappings are only loaded for visible neurons, and only in the current 2D window field of view. Without those mappings, all annotations that are linked to Supervoxel IDs and outside of the current 2D window field of view won't be visible in the 3D view: https://nkem-multicut-dot-neuromancer-seung-import.appspot.com/?json_url=https://www.dynamicannotationframework.com/nglstate/5652961799700480 Don't think we can collect all supervoxel for each selected object, since neurons/mergers can easily accumulate to millions of supervoxel.

Issue 2: Each Split/Merge modifies ChunkedGraph Node IDs (other than Supervoxel IDs). Which means we would need to update such linked IDs. Or maybe keep referring to all previous/future generations of a Root ID?

Thoughts Forcing the use of root IDs instead of Supervoxel IDs for each point annotation seems to be the better choice... but it would require to have another ChunkedGraph query. Something that connects a selection of linked Node IDs to currently selected Root IDs?

[nkemnitz]

Blocked until we have RowSets for the graph server