user/src/com/google/gwt/layout/Layout.gwt.xml

<!--                                                                        -->
<!-- Copyright 2009 Google Inc.                                             -->
<!-- Licensed under the Apache License, Version 2.0 (the "License"); you    -->
<!-- may not use this file except in compliance with the License. You may   -->
<!-- may obtain a copy of the License at                                    -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Unless required by applicable law or agreed to in writing, software    -->
<!-- distributed under the License is distributed on an "AS IS" BASIS,      -->
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<!-- limitations under the License.                                         -->

<module>
  <inherits name="com.google.gwt.core.Core"/>
  <inherits name="com.google.gwt.useragent.UserAgent"/>
  <inherits name="com.google.gwt.dom.DOM"/>
  <inherits name="com.google.gwt.animation.Animation"/>
  <inherits name="com.google.gwt.aria.Aria"/>

  <source path="client" />

  <replace-with class="com.google.gwt.layout.client.LayoutImplIE8">
    <when-type-is class="com.google.gwt.layout.client.LayoutImpl"/>
    <any>
      <when-property-is name="user.agent" value="ie8"/>
      <!-- IE9 is only bound explicitly to the IE8 impl because leaving -->
      <!-- it unbound leads to a warning when compiling. If attempting  -->
      <!-- to let IE9 use a non-IE8 impl, explicitly bind it to avoid   -->
      <!-- this warning                                                 -->
      <when-property-is name="user.agent" value="ie9"/>
    </any>
  </replace-with>
</module>