Andreas Kling 82559e211d LibGUI: Add GModelSelection to help implementing multiple-select views ...

Each GAbstractView now has a GModelSelection backed by a simple
HashTable<GModelIndex>. When the selection changes somehow, the view
gets notified via the notify_selection_changed() callback.

In the future it will probably make sense to move to using some kind of
ranges as the internal representation instead.

2019-09-07 19:21:07 +02:00

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