Body: Store the previous position every time the position is set.
tree97e624fb0cdd44720b318b8e724cf737efbdfeef
-rw-r--r-- 16 .gitignore
-rw-r--r-- 11358 LICENSE
-rw-r--r-- 216 NOTICE
-rw-r--r-- 509 README
-rw-r--r-- 3319 build.xml
-rw-r--r-- 82 manifest.mf
drwxr-xr-x - nbproject
drwxr-xr-x - src
drwxr-xr-x - test