the rendered diff cannot display differences between two images having same name

Reproduction steps:

• Disable realtime editing (due to current limitation forcing the upload with realtime)
• Enable rendered diff
• Go to Sandbox page and start editing it
• Remove the XWikiLogo displayed image in the page
• Upload the XWikiLogo.png image added to this issue and insert it in the content where the image previously was
• Save the change request
• Display the changes and the rendered diff

Expected result:

• the rendered diff should display a difference between the two images

Obtained result:

• the rendered diff displays twice the old image