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
* e.g. <code>Vector.class - java.util</code>
	 */	
	public final static int CF_POST_QUALIFIED= 1 << 19;
	
	/**
	 * Compilation unit names are fully qualified.
	 * e.g. <code>java.util.Vector.java</code>
	 */	
	public final static int CU_QUALIFIED= 1 << 20;
	
	/**
	 * Compilation unit names are post  qualified.
	 * e.g. <code>Vector.java - java.util</code>
	 */	
	public final static int CU_POST_QUALIFIED= 1 << 21;
	/**
	 * Package names are qualified.
	 * e.g. <code>MyProject/src/java.util</code>
	 */	
	public final static int P_QUALIFIED= 1 << 22;
	
	/**
	 * Package names are post qualified.
	 * e.g. <code>java.util - MyProject/src</code>
	 */	
	public final static int P_POST_QUALIFIED= 1 << 23;
	/**
	 * Package Fragment Roots contain variable name if from a variable.
	 * e.g. <code>JRE_LIB - c:\java\lib\rt.jar</code>
	 */