Translations:Parsing/Replacing Tidy/FAQ/12/en

Early on, we found that a common difference was minor vertical whitespace changes. In the belief that these would either not be noticeable or would be tolerable, we wrote a tool called "UprightDiff" which is able to identify vertical motion within an image and to discount such motion for the purposes of automated testing. This also let us assign a numeric score to differences and readily identify the most egregious differences.