Bug 45638 [preferences] overwrite mode setting
Needs to be moved to Java>Editor>Typing.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
/**
	 * A string value used by the named preference <code>OPEN_TYPE_HIERARCHY</code>.
	 * 
	 * @see #OPEN_TYPE_HIERARCHY
	 */
	public static final String OPEN_TYPE_HIERARCHY_IN_PERSPECTIVE= "perspective"; 
	/**
	 * A string value used by the named preference <code>OPEN_TYPE_HIERARCHY</code>.
	 * 
	 * @see #OPEN_TYPE_HIERARCHY
	 */
	public static final String OPEN_TYPE_HIERARCHY_IN_VIEW_PART= "viewPart"; 
	
	/**
	 * A named preference that controls the behaviour when double clicking on a container in the packages view. 
	 * <p>
	 * Value is of type <code>String</code>: possible values are <code>
	 * DOUBLE_CLICK_GOES_INTO</code> or <code>
	 * DOUBLE_CLICK_EXPANDS</code>.
	 * </p>
	 * 
	 * @see #DOUBLE_CLICK_EXPANDS
	 * @see #DOUBLE_CLICK_GOES_INTO
	 */
	public static final String DOUBLE_CLICK= "packageview.doubleclick"; 
	/**
	 * A string value used by the named preference <code>DOUBLE_CLICK</code>.
	 * 
	 * @see #DOUBLE_CLICK
	 */