Pre-commit patches diff is mixing files together

Hi,

When I upload a patch with multiple files for a pre-commit review, the diff functionality is mixing files contents...
For example, let's suppose you have three files on the patch, File A, File B and File C:

• If you click on File A on the left window, changes in File A, File B and File C are displayed on the diff window.
• If you click on File B on the left window, changes in File B and File C are displayed on the diff window.
• If you click on File C on the left window, only changes in File C are displayed on the diff window.

It should only display the diff of the file selected on the left panel.

Please see the screenshots for more details.