Bug 64298 JAR files already in build path still shown when adding JARs.
When adding JARs to the Java build path in 3.0M9, the JAR's that are already added do not get filtered out anymore like with all previous builds (M8 and lower). Instead, the complete list of all available JARs is shown.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
}
			}
		}
		return true;
	}	
	/**
	 * Method editEntry.
	 */
	private void editEntry() {
		List selElements= fLibrariesList.getSelectedElements();
		if (selElements.size() != 1) {
			return;
		}
		Object elem= selElements.get(0);
		if (fLibrariesList.getIndexOfElement(elem) != -1) {
			editElementEntry((CPListElement) elem);
		} else if (elem instanceof CPListElementAttribute) {
			editAttributeEntry((CPListElementAttribute) elem);
		}
	}
	
	private void editAttributeEntry(CPListElementAttribute elem) {
		String key= elem.getKey();
		if (key.equals(CPListElement.SOURCEATTACHMENT)) {
			CPListElement selElement= elem.getParent();
			
			IPath containerPath= null;
			boolean applyChanges= false;
			Object parentContainer= selElement.getParentContainer();
			if (parentContainer instanceof CPListElement) {