Allow me to see a diff before I hit save.

Quite often I might have made some changes to a saved query, and days / hours later don't know what I changed and if I want to keep the change.

My current workaround is to save to a new filename and run kdiff, but it would be nice to integrate this feature into the program.

I could just put all my snippets in a repo, but that is probably overkill for most people. As .linq files are just text files this should be relatively straightforward.