Improve setup performance by registering via a .pkgdef file in VS 2010 and later.
Whenever VS 2010 (and later) are installed, it is possible to register in those instances with a .pkgdef file in the right location. This would allow removing the devenv.exe /setup step for these instances.
It would be nice to leave the registry registrations when the instance is *not* found, to allow preinstalling before Visual Studio. The next upgrade after installing would then switch to the vsix install and as that updates the .pkgdef it wouldn't require running the /setup either.
I think the only case that requires /setup would be uninstall before switching to .pkgdef
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