user/src/com/google/gwt/debug/Debug.gwt.xml

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<!-- Copyright 2008 Google Inc.                                             -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Adds debug ID support for UIObjects.                                   -->
<module>
  <inherits name="com.google.gwt.core.Core" />
  
  <!-- Enable or disable the UIObject.ensureDebugID method -->
  <define-property name="gwt.enableDebugId" values="true, false"/>
  
  <!-- Default to enabled -->
  <set-property name="gwt.enableDebugId" value="true"/> 

  <!-- Replace the DebugIdImpl -->
  <replace-with class="com.google.gwt.user.client.ui.UIObject.DebugIdImplEnabled">
    <when-type-is class="com.google.gwt.user.client.ui.UIObject.DebugIdImpl"/>
    <when-property-is name="gwt.enableDebugId" value="true"/>
  </replace-with>

  <!-- Replace the DebugInfoImpl -->
  <replace-with class="com.google.gwt.debug.client.DebugInfo.DebugInfoImplEnabled">
    <when-type-is class="com.google.gwt.debug.client.DebugInfo.DebugInfoImpl"/>
    <when-property-is name="gwt.enableDebugId" value="true"/>
  </replace-with>
</module>