Bug 111453 [preferences] Improve preview of enum constant formatting
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/LineWrappingTabPage.java
"private static final String string = \"TextTextText\";" + 
		    "void foo() {" + 
		    "for (int i = 0; i < 10; i++) {}" + 
		    "String s;" + 
		    "s = \"TextTextText\";}}", 
	        FormatterMessages.LineWrappingTabPage_assignment_alignment
		);
	
	/**
	 * The default preview line width.
	 */
	private static int DEFAULT_PREVIEW_WINDOW_LINE_WIDTH= 40;
	
	/**
	 * The key to save the user's preview window width in the dialog settings.
	 */
	private static final String PREF_PREVIEW_LINE_WIDTH= JavaUI.ID_PLUGIN + ".codeformatter.line_wrapping_tab_page.preview_line_width"; 
	
	/**
	 * The dialog settings.
	 */
	protected final IDialogSettings fDialogSettings;	
	
	protected TreeViewer fCategoriesViewer;
	protected Label fWrappingStylePolicy;
	protected Combo fWrappingStyleCombo;
	protected Label fIndentStylePolicy;
	protected Combo fIndentStyleCombo;
	protected Button fForceSplit;
	protected CompilationUnitPreview fPreview;