user/src/com/google/gwt/event/dom/DragEvent.gwt.xml

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<module>

  <!-- Define the support property -->
  <define-property name="dragEventSupport" values="maybe,no" />

  <!--
    Modern browsers either support drag events or will probably add drag
    support in the future.
  -->
  <set-property name="dragEventSupport" value="maybe" />

  <replace-with class="com.google.gwt.event.dom.client.DragDropEventBase.DragSupportDetectorNo">
    <when-type-is class="com.google.gwt.event.dom.client.DragDropEventBase.DragSupportDetector" />
    <when-property-is name="dragEventSupport" value="no" />
  </replace-with>
</module>