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
}
		} else {
			IPath path= BuildPathDialogAccess.configureVariableEntry(getShell(), existing.getPath(), existingPathsArray);
			if (path != null) {
				CPListElement elem= new CPListElement(fCurrJProject, IClasspathEntry.CPE_VARIABLE, path, null);
				return new CPListElement[] { elem };
			}
		}
		return null;
	}
	private CPListElement[] openContainerSelectionDialog(CPListElement existing) {
		if (existing == null) {
			IClasspathEntry[] created= BuildPathDialogAccess.chooseContainerEntries(getShell(), fCurrJProject, getRawClasspath());
			if (created != null) {
				CPListElement[] res= new CPListElement[created.length];
				for (int i= 0; i < res.length; i++) {
					res[i]= new CPListElement(fCurrJProject, IClasspathEntry.CPE_CONTAINER, created[i].getPath(), null);
				}
				return res;
			}
		} else {
			IClasspathEntry created= BuildPathDialogAccess.configureContainerEntry(getShell(), existing.getClasspathEntry(), fCurrJProject, getRawClasspath());
			if (created != null) {
				CPListElement elem= new CPListElement(fCurrJProject, IClasspathEntry.CPE_CONTAINER, created.getPath(), null);
				return new CPListElement[] { elem };
			}
		}		
		return null;
	}