Flaky test: Dragging and dropping files

[winstliu]

https://ci.appveyor.com/project/Atom/tree-view/build/364/job/ia7chigt87914irl in #1173
Looks like all the d&d specs timed out.

TreeView
  Dragging and dropping files
    when dropping a FileView onto a DirectoryView's header
      it should move the file to the hovered directory
        timeout: timed out after 60000 msec waiting for directory view contents to refresh
    when dropping a DirectoryView onto a DirectoryView's header
      it should move the directory to the hovered directory
        Expected { onDragLeave : Function, onDragEnter : Function, onStylesheetsChanged : Function, id : 346, element : HTMLNode, list : HTMLNode, disposables : { disposables : Set {[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]} }, emitter : { handlersByEventName : { entry-moved : [ Function ], entry-deleted : [ Function ], did-destroy : [ Function, Function ] } }, roots : [ HTMLNode ], selectedPath : 'C:\projects\tree-view\spec\fixtures\root-dir1', ignoredPatterns : [  ], useSyncFS : false, currentlyOpening : {  }, dragEventCounts : {  }, rootDragAndDrop : { treeView : <circular reference: Object>, onDrop : Function, onDropOnOtherWindow : Function, onDragOver : Function, onDragEnd : Function, onDragLeave : Function, onDragStart : Function } } to be undefined.
          at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:46:62)
        timeout: timed out after 60000 msec waiting for directory view contents to refresh
      it shows a warning notification and does not move the directory if it would result in recursive copying
        Expected { onDragLeave : Function, onDragEnter : Function, onStylesheetsChanged : Function, id : 346, element : HTMLNode, list : HTMLNode, disposables : { disposables : Set {[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]} }, emitter : { handlersByEventName : { entry-moved : [ Function ], entry-deleted : [ Function ], did-destroy : [ Function, Function ] } }, roots : [ HTMLNode ], selectedPath : 'C:\Users\appveyor\AppData\Local\Temp\1\tree-view11784-1292-15955u.xbljvy4x6r\gamma\theta\theta.txt', ignoredPatterns : [  ], useSyncFS : false, currentlyOpening : {  }, dragEventCounts : {  }, rootDragAndDrop : { treeView : <circular reference: Object>, onDrop : Function, onDropOnOtherWindow : Function, onDragOver : Function, onDragEnd : Function, onDragLeave : Function, onDragStart : Function } } to be undefined.
          at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:46:62)
    when dragging a file from the OS onto a DirectoryView's header
      it should move the file to the hovered directory
        timeout: timed out after 60000 msec waiting for directory view contents to refresh
    when dragging a directory from the OS onto a DirectoryView's header
      it should move the directory to the hovered directory
        Expected { onDragLeave : Function, onDragEnter : Function, onStylesheetsChanged : Function, id : 347, element : HTMLNode, list : HTMLNode, disposables : { disposables : Set {[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]} }, emitter : { handlersByEventName : { entry-moved : [ Function ], entry-deleted : [ Function ], did-destroy : [ Function, Function ] } }, roots : [ HTMLNode ], selectedPath : 'C:\projects\tree-view\spec\fixtures\root-dir1', ignoredPatterns : [  ], useSyncFS : false, currentlyOpening : {  }, dragEventCounts : {  }, rootDragAndDrop : { treeView : <circular reference: Object>, onDrop : Function, onDropOnOtherWindow : Function, onDragOver : Function, onDragEnd : Function, onDragLeave : Function, onDragStart : Function } } to be undefined.
          at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:46:62)
        timeout: timed out after 60000 msec waiting for directory view contents to refresh
    when dragging a file and directory from the OS onto a DirectoryView's header
      it should move the file and directory to the hovered directory
        Expected { onDragLeave : Function, onDragEnter : Function, onStylesheetsChanged : Function, id : 347, element : HTMLNode, list : HTMLNode, disposables : { disposables : Set {[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]} }, emitter : { handlersByEventName : { entry-moved : [ Function ], entry-deleted : [ Function ], did-destroy : [ Function, Function ] } }, roots : [ HTMLNode ], selectedPath : 'C:\projects\tree-view\spec\fixtures\root-dir1', ignoredPatterns : [  ], useSyncFS : false, currentlyOpening : {  }, dragEventCounts : {  }, rootDragAndDrop : { treeView : <circular reference: Object>, onDrop : Function, onDropOnOtherWindow : Function, onDragOver : Function, onDragEnd : Function, onDragLeave : Function, onDragStart : Function } } to be undefined.
          at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:46:62)
        timeout: timed out after 60000 msec waiting for directory view contents to refresh
  the alwaysOpenExisting config option
    it defaults to unset
      Expected { onDragLeave : Function, onDragEnter : Function, onStylesheetsChanged : Function, id : 347, element : HTMLNode, list : HTMLNode, disposables : { disposables : Set {[object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object][object Object]} }, emitter : { handlersByEventName : { entry-moved : [ Function ], entry-deleted : [ Function ], did-destroy : [ Function, Function ] } }, roots : [ HTMLNode ], selectedPath : 'C:\projects\tree-view\spec\fixtures\root-dir1', ignoredPatterns : [  ], useSyncFS : false, currentlyOpening : {  }, dragEventCounts : {  }, rootDragAndDrop : { treeView : <circular reference: Object>, onDrop : Function, onDropOnOtherWindow : Function, onDragOver : Function, onDragEnd : Function, onDragLeave : Function, onDragStart : Function } } to be undefined.
        at jasmine.Spec.<anonymous> (file:///C:/projects/tree-view/spec/tree-view-package-spec.coffee:46:62)