sin-ack d73116e5d5 LibGUI: Implement persistent indices for models ...

This patch adds persistent indices to models.  A PersistentModelIndex is
a ModelIndex that will survive most model updates (provided that the
data the PersistentModelIndex points to has not been removed by the
model's data store).  PersistentModelIndex objects can be safely held
by objects outside the model they originated from.

2021-08-08 14:13:37 +02:00

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