Bug 32893 Workspace Compatibility Problems 2.0 -> 2.1
Build 2.1 RC1 This PR collects problems related to opening a 2.0 workspace with 2.1.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
public static final String APPEARANCE_COMPRESS_PACKAGE_NAMES= "org.eclipse.jdt.ui.compresspackagenames";
	/**
	 * A named preference that controls if empty inner packages are folded in
	 * the hierarchical mode of the package explorer.
	 * <p>
	 * Value is of type <code>Boolean</code>: if <code>true</code> empty
	 * inner packages are folded.
	 * </p>
	 * @since 2.1
	 */
	public static final String APPEARANCE_FOLD_PACKAGES_IN_PACKAGE_EXPLORER= "org.eclipse.jdt.ui.flatPackagesInPackageExplorer";
	/**
	 * A named preference that defines how member elements are ordered by the
	 * Java views using the <code>JavaElementSorter</code>.
	 * <p>
	 * Value is of type <code>String</code>: A comma separated list of the
	 * following entries. Each entry must be in the list, no duplication. List
	 * order defines the sort order.
	 * <ul>
	 * <li><b>T</b>: Types</li>
	 * <li><b>C</b>: Constructors</li>
	 * <li><b>I</b>: Initializers</li>
	 * <li><b>M</b>: Methods</li>
	 * <li><b>F</b>: Fields</li>
	 * <li><b>SI</b>: Static Initializers</li>
	 * <li><b>SM</b>: Static Methods</li>
	 * <li><b>SF</b>: Static Fields</li>
	 * </ul>
	 * </p>
	 * @since 2.1