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Brad King authored
Git does not automatically checkout the matching version of a submodule when it checks out a new version of the parent project in the work tree. If the submodule reference changed in the parent project then we were reporting the submodule path as a local modification. Work around the problem in ctest_update using "git submodule update" after "git pull". For projects with no submodules this is a no-op. See issue #10662. Also add a submodule to the test project for CTest.UpdateGIT to test the work-around.
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