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java.lang.IllegalArgumentException: The 'no duplicates' constraint is violated	at org.eclipse.emf.common.util.AbstractEList.set(AbstractEList.java:264)	at org.eclipse.emf.common.util.AbstractEList$EListIterator.doSet(AbstractEList.java:959)	at org.eclipse.emf.common.util.AbstractEList$EListIterator.set(AbstractEList.java:937)	at java.util.List.sort(List.java:482)	at java.util.Collections.sort(Collections.java:175)	at eu.numberfour.ide.n4js.ui.organize.imports.N4JSOrganizeImports.sortByName(N4JSOrganizeImports.java:458)	at eu.numberfour.ide.n4js.ui.organize.imports.N4JSOrganizeImports.extractPureText(N4JSOrganizeImports.java:615)	at eu.numberfour.ide.n4js.ui.organize.imports.N4JSOrganizeImports.lambda$1(N4JSOrganizeImports.java:181)