Bug 16858 Preceding space in package compression pattern sometimes ignored
(In the following discussion, all patterns were entered without the enclosing quote marks.) The pattern "1 " causes one character of each package name to be displayed with a single space separator between them. The pattern " 1 " causes one space to precede the first single-character package name and two spaces to appear between each one. Both of the above cases were expected. However, if you set the patttern to " 1" (i.e. space before, but no space after), no spaces are displayed in the result.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/viewsupport/JavaElementLabels.java
* Type names are type container qualified.
	 * e.g. <code>Map.MapEntry</code>
	 */
	public final static int T_CONTAINER_QUALIFIED= 1 << 14;
	
	/**
	 * Type names are post qualified.
	 * e.g. <code>MapEntry - java.util.Map</code>
	 */
	public final static int T_POST_QUALIFIED= 1 << 15;
	
	/**
	 * Declarations (import container / declarartion, package declarartion) are qualified.
	 * e.g. <code>java.util.Vector.class/import container</code>
	 */	
	public final static int D_QUALIFIED= 1 << 16;
	
	/**
	 * Declarations (import container / declarartion, package declarartion) are post qualified.
	 * e.g. <code>import container - java.util.Vector.class</code>
	 */	
	public final static int D_POST_QUALIFIED= 1 << 17;	
	/**
	 * Class file names are fully qualified.
	 * e.g. <code>java.util.Vector.class</code>
	 */	
	public final static int CF_QUALIFIED= 1 << 18;
	
	/**
	 * Class file names are post qualified.