Bug 32254 [Viewers] AbstractTreeViewer uses HashSet to remember expansion state
I20030216 The custom hash table should be used instead. Otherwise expansion state may be lost due to a different equals implementation of the element and the IElementComparer.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
}
/* (non-Javadoc)
 * Method declared in Viewer.
 */
public Control getControl() {
	return tree;
}
/* (non-Javadoc)
 * Method declared in AbstractTreeViewer.
 */
protected boolean getExpanded(Item item) {
	return ((TreeItem) item).getExpanded();
}
/* (non-Javadoc)
 * Method declared in StructuredViewer.
 */
protected Item getItem(int x, int y) {
	return getTree().getItem(getTree().toControl(new Point(x, y)));
}
/* (non-Javadoc)
 * Method declared in AbstractTreeViewer.
 */
protected int getItemCount(Control widget) {
	return ((Tree) widget).getItemCount();
}
/* (non-Javadoc)
 * Method declared in AbstractTreeViewer.
 */
protected int getItemCount(Item item) {
	return ((TreeItem) item).getItemCount();