in src/main/java/org/apache/sling/jcr/base/internal/mount/ProxyWorkspace.java [92:98]
public void copy(String srcWorkspace, String srcAbsPath, String destAbsPath) throws NoSuchWorkspaceException, ConstraintViolationException, VersionException, AccessDeniedException, PathNotFoundException, ItemExistsException, LockException, RepositoryException {
if (mountSession.isMount(srcAbsPath) && mountSession.isMount(destAbsPath)) {
delegate2.copy(srcWorkspace, srcAbsPath, destAbsPath);
} else {
delegate.copy(srcWorkspace, srcAbsPath, destAbsPath);
}
}