Currently, when a project's target framework is retargeted (aka project retargeting), a build error is shown if there are packages that need to be reinstalled because of the retargeting. Plus, on subsequent builds, a build warning is shown until the packages are reinstalled as needed
Similar behavior is expected for platform retargeting as well. That is, when a Windows 8.0 project is retargeted to Windows 8.1 on Microsoft Visual Studio 2013 Preview
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