Marked Query Changes

When making changes to a query it's difficult to identify the changes that had been made recently when going back to making even more changes. Each time the query editor is opened, a "Session" should be created that colours or marks the changes made in that session. This means when going back to make further changes it is easy to identify what you've done. It would also be useful if an errors could be marked on the action pane. This would therefore make error finding alot easier rather than clicking the banner that currently appears.