Add extension to image comparison

[Danny]

Long time no see. ;D

If you try to compare different filetypes of the same image, and thus have the same file name, you don't know which one is which without the extension.

For example, i was trying to compare an image stored as JPG and JP2, and since they both had the same name... So please add the file extension to the name in the upper left.

[eL_PuSHeR]

I think this was included in v1.98.2

What version are you using?.