3.0.0 beta 4

Added

• Initial version of Ordering!
  • Nodes, groups and links can now be ordered using the new Order property or SendToFront/Back methods
  • Diagram.OrderedSelectables returns the ordered selectables/models
  • DiagramCanvas now uses this new property to render everything
• GridSnapToCenter option in order to snap nodes from their center instead of their top/left position (thanks to @Jeremy Vance)
• More unit tests

Changed

• Groups is not a list of groups anymore, but a layer instead (just like Nodes and Links)

Fixed

• Deleting a group doesn't delete links attached to it
• Deleting a group inside of a group doesn't refresh the parent group
• Links not refreshing when a group's dimensions are updated directly (e.g. deleting a child)
• Layers causing more refreshes than intended

Removed

• All group-related methods and events from Diagram, please use the new layer from now on