/**
* Reverts the input for the tree back to the state when the adapter was created.
*
* <p>All of the frames are removed from the drill stack. Then the oldest frame is used to reset
* the input and expansion state for the child tree.
*/
public void goHome() {
Object currentInput = fChildTree.getInput();
DrillFrame oFrame = fDrillStack.goHome();
Object input = oFrame.getElement();
fChildTree.setInput(input);
expand(oFrame.getExpansion());
// if there was a selection, it should have been preserved,
// but if not, select the element that was last drilled into
if (fChildTree.getSelection().isEmpty()) {
fChildTree.setSelection(new StructuredSelection(currentInput), true);
}
updateNavigationButtons();
}
