Flaky test: Git status decorations -> when a file is selected in a directory and is deleted, it updates the style of the directory

[winstliu]

First time I've seen this. https://ci.appveyor.com/project/Atom/tree-view/build/356/job/h3k1m0a7o7mhsx3f (build for PR #1169)

TreeView
  Git status decorations
    when a file is selected in a directory
      when the file is deleted
        it updates the style of the directory
          Expected 'C:\Users\appveyor\AppData\Local\Temp\1\tree-view-project117724-1924-clatep.ic5gynwmi\file.txt' to contain 'dir2\new2'.
            at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:2975:54)
          Expected spy updateStatus to have been called.
            at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:2982:50)