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
* 
	 * @since 2.1
	 */
	public static final String EDITOR_BOLD_SUFFIX= "_bold"; 
	/**
	 * A named preference that holds the color used to render multi line comments.
	 * <p>
	 * Value is of type <code>String</code>. A RGB color value encoded as a string
	 * using class <code>PreferenceConverter</code>
	 * </p>
	 * 
	 * @see org.eclipse.jface.resource.StringConverter
	 * @see org.eclipse.jface.preference.PreferenceConverter
	 */
	public final static String EDITOR_MULTI_LINE_COMMENT_COLOR= IJavaColorConstants.JAVA_MULTI_LINE_COMMENT;
	/**
	 * The symbolic font name for the Java editor text font 
	 * (value <code>"org.eclipse.jdt.ui.editors.textfont"</code>).
	 * 
	 * @since 2.1
	 */
	public final static String EDITOR_TEXT_FONT= "org.eclipse.jdt.ui.editors.textfont"; 
	/**
	 * A named preference that controls whether multi line comments are rendered in bold.
	 * <p>
	 * Value is of type <code>Boolean</code>. If <code>true</code> multi line comments are rendered
	 * in bold. If <code>false</code> the are rendered using no font style attribute.
	 * </p>
	 */
	public final static String EDITOR_MULTI_LINE_COMMENT_BOLD= IJavaColorConstants.JAVA_MULTI_LINE_COMMENT + EDITOR_BOLD_SUFFIX;