     return unless @draggedTab
     @lastDropTargetIndex = null
 
-    event.dataTransfer.setData 'atom-event', 'true'
+    event.dataTransfer.setData 'atom-tab-event', 'true'
 
     @draggedTab.element.classList.add('is-dragging')
     @draggedTab.destroyTooltip()


  # Show the tab bar when a tab is being dragged in this pane when alwaysShowTabBar = false
  onPaneDragEnter: (event) ->
    return if @pane.getItems().length > 1 or atom.config.get('tabs.alwaysShowTabBar')
    if @paneElement.contains(event.relatedTarget)
      @element.classList.remove('hidden')

  # Hide the tab bar when the dragged tab leaves this pane when alwaysShowTabBar = false
  onPaneDragLeave: (event) ->
    return if @pane.getItems().length > 1 or atom.config.get('tabs.alwaysShowTabBar')
    unless @paneElement.contains(event.relatedTarget)
      @element.classList.add('hidden')

  onDrop: (event) ->
    event.preventDefault()

    return unless isAtomTabEvent(event)

    fromWindowId  = parseInt(event.dataTransfer.getData('from-window-id'))
    fromPaneId    = parseInt(event.dataTransfer.getData('from-pane-id'))
