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/ModifyDialogTabPage.java
public void restoreFocus() {
			int index= 0;
			try {
				index= fDialogSettings.getInt(PREF_LAST_FOCUS_INDEX);
				
				if ((index >= 0) && (index <= fItemList.size() - 1)) {
					((Control)fItemList.get(index)).setFocus();
				}
			} catch (NumberFormatException ex) {
				
			}
		}
		
		public void resetFocus() {
			fDialogSettings.put(PREF_LAST_FOCUS_INDEX, -1);
		}
	}
	/**
	 * The default focus manager. This widget knows all widgets which can have the focus
	 * and listens for focusGained events, on which it stores the index of the current
	 * focus holder. When the dialog is restarted, <code>restoreFocus()</code> sets the 
	 * focus to the last control which had it.
	 * 
	 * The standard Preference object are managed by this focus manager if they are created
	 * using the respective factory methods. Other SWT widgets can be added in subclasses 
	 * when they are created.
	 */
	protected final DefaultFocusManager fDefaultFocusManager;