Emitted when the selection has changed in the tree.
The tree selection, representing the selected nodes from the tree. If nothing is selected, the result will be empty.
Registers the given selection into the tree selection service. If the selection state changes after adding the
selectionOrTreeNode argument, a selection changed event will be fired. If the argument is a tree node,
a it will be treated as a tree selection with the default selection type.
Dispose this object.
Restore selection state.
Store selection state.