You can diff shelved files to compare, accept, or reject differences between the file stored in the shelf and the file in another location.
Note: You cannot diff shelved files that are not yet under source control.
1. Choose View > Shelves.
2. Select a shelved file and click Differences.
The Differences dialog box opens. Read-only information is displayed in the First File area.
3. Select a Second File option.
4. Click Differences.
The differences application opens.