Bug 40772 [plan item] Smart tab on empty lines
When having the caret on an empty line, pressing tab cleans up the line and sets the caret it the right indentation column.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
* A named preference that controls whether to use the prefix "is" or the prefix "get" for
	 * automatically created getters which return a boolean field.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @since 3.0
	 */
	public static final String CODEGEN_IS_FOR_GETTERS= "org.eclipse.jdt.ui.gettersetter.use.is"; 
	
	/**
	 * A named preference that controls if comment stubs will be added
	 * automatically to newly created types and methods.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @since 2.1
	 */
	public static final String CODEGEN_ADD_COMMENTS= "org.eclipse.jdt.ui.javadoc"; 
	/**
	 * A named preference that controls if a comment stubs will be added
	 * automatocally to newly created types and methods.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * @deprecated Use CODEGEN_ADD_COMMENTS instead (Name is more precice).
	 */
	public static final String CODEGEN__JAVADOC_STUBS= CODEGEN_ADD_COMMENTS;
	/**
	 * A named preference that controls if a non-javadoc comment gets added to methods generated via the 
	 * "Override Methods" operation.