xib - How to avoid Xcode gratuitous edits to storyboard files?

Question

When I navigate to one of my xib files, Xcode marks the file as touched. Undo and revert have no effect. Saving seems to do no harm, but the glitch causes me frequent additional git work.

Has anyone else seen this or have an idea about something in my MainWindow.xib that would cause it?

Edit in 2019 - still happening!

Answer 1

Apple says it's a known issue:

This is a follow up to Bug ID# 9847336. After further investigation it has been determined that this is a known issue, which is currently being investigated by engineering. This issue has been filed in our bug database under the original Bug ID# 9056156. The original bug number being used to track this duplicate issue can be found in the State column, in this format: Duplicate/OrigBug#.