unique

I have used unique for an hour, and I am very impressed. I have a few of quibbles. The differences between the matches should be highlighted. I need be sure that I caught all the differences between two pieces of code before extracting a common method. I find it hard to compare the matches when they are placed next to each other. Perhaps separate windows that I can align as I need would work. A button that will allow me to repeat the previous operation with a single click will be nice.