ClassFileWorkingCopy.getFileName() does not follow spec of IDependent

ClassFileWorkingCopy extends CompilationUnit, which implements org.eclipse.jdt.internal.compiler.env.ICompilationUnit which implements IDependent.

IDependent has following method: `char[] getFileName();`

The javadoc on this method indicates getFileName() should return a string like `/lib/some.zip|/com/q/Y.class`

CompilationUnit (and it's subclass, ClassFileWorkingCopy) returns the following for this method call: getPath().toString().toCharArray();

`getPath()` is from IJavaElement, and says it must return basically the path to the archive itself, without the pipe character and package and class details within the archive.

With this in mind, if a ClassFileWorkingCopy is from inside an archive, it should not be using `getPath().toString().toCharArray()` as its `getFileName()` implementation, because this will only return the path to the archive, and leave out the remaining requirements from `IDependent.getFileName()`.

// BIG PROBLEM HERE!!!
// IJavaElement#getPath() has different specs than
// org.eclipse.jdt.internal.compiler.env.IDependent#getFileName()