Bug 77636 Code Formatter Profile Editor should be more fault-tolerant [formatter]
200411022000 The Code Formatter Profile Editor should be more fault-tolerant. Especially on 'White Space' and 'Line Wrapping' tabs, it is very easy to mess things up by changing many settings at once with a single click at the wrong spot. Two possible solutions came to my mind: (1) The dialog could support an undo/redo-stack (via keybindings and/or via additional buttons on the bottom row) (2) The dialog could offer an 'Apply' button, with which the user could save the changes done so far. The current workaround for this is to leave the dialog via OK and then re-enter it, but that's cumbersome when you want to do a pass over all options.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/WhiteSpaceTabPage.java
index= fDialogSettings.getInt(PREF_NODE_KEY);
			} catch (NumberFormatException ex) {
				index= -1;
			}
			if (index < 0 || index > fIndexedNodeList.size() - 1) {
				index= 0;
			}
			final Node node= (Node)fIndexedNodeList.get(index);
			if (node != null) {
			    fTreeViewer.expandToLevel(node, 0);
			    fTreeViewer.setSelection(new StructuredSelection(new Node [] {node}));
			    fLastSelected= node;
			}
		}
        public void doubleClick(DoubleClickEvent event) {
            final ISelection selection= event.getSelection();
            if (selection instanceof IStructuredSelection) {
                final Node node= (Node)((IStructuredSelection)selection).getFirstElement();
                fTreeViewer.setExpandedState(node, !fTreeViewer.getExpandedState(node));
            }
        }
        
        public Control getControl() {
            return fComposite;
        }
	}
	
	
	
	private final class JavaElementComponent implements ISelectionChangedListener, ICheckStateListener {