It would be very useful to have some warning that the solution has been changed and the version on your machine is not the latest one - on opening the solution.

Example:
We have multiple developers working on the solutions in the repository.

If you open a solution that has had changes made to it since the last time you opened it, you cannot tell that it has been changed until you do and update.

If you forget to do this every time you could have a big problem when it comes back to committing it back to the SVN Server.