GroupApi<T, C> extension

Group and node monitoring operations for NodeFlowController.

This extension provides APIs for:

  • Setting up node monitoring reactions (for GroupNode tracking)
  • Managing drag contexts for group operations
  • Moving nodes by delta (used by GroupNode to move children)
  • Finding nodes within bounds (for containment detection)
  • Notifying groupable nodes of additions/deletions

These are primarily internal operations used by GroupNode and GroupableMixin implementations.

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