Duplicate lines and exchange symbols (x/y, width/height, add/remove, etc..). Usefull for front dev.
If you duplicate again the line you just duplicate you get extra exchange
If you duplicate the last lines of the files, the duplicated line will be over the original line.
Inspired by the duplicate FlashDevelop plugin and dev by @makio64
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.