Clicking twice in succession in file list column header (such as to toggle the sort order twice quickly) has the side effect of also opening the selected file(s) in the list below.

In the attached example, double-clicking on the "Path" column header causes BusinessSelectionViewController.m to be opened in Xcode.

Double-click handling in the table view is evidently wrong; only double-clicks on a selected table row should have such an effect.