Merge branch 'master' into xin

xin

5 days ago 8a7f9301f4b9e6fcd4e1b3014fb8c5d52820e179

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="VcsDirectoryMappings">
    <mapping directory="$PROJECT_DIR$" vcs="Git" />
  </component>
</project>