TestExecute Prompts to Save Keyword Test when Exiting

When finished running a test, TestExecute sometimes prompts whether to save the changes to the Keyword Test.  The Keyword Test date-time stamp is changed, but a diff of the old and new file shows no changes.



Why is TestExecute prompting for a file save and can I prevent this behavior?  We are using the file date-time stamps for version control and do not want the files to be overwritten.