Get selected PsiDirectory's when more than one is selected

I have the following code, which returns an array with length=1 when only one directory is selected, but returns an empty array when more than one is selected.  I feel like I have to missing something stupid/easy here?  Can anyone help me out?

        IdeView ideView = evt.getData(LangDataKeys.IDE_VIEW);
        PsiDirectory[] directories = ideView.getDirectories();

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