Make in-game windows snap to each other.
2.0.1 alpha 41 or later
Configuration file: windowsnap on|off|<dist>
Command line: -Xz
This switch enables the window snapping feature, by which windows that are moved close to one another snap together. The <dist> parameter sets how close windows have to be for this to happen, the default being 10 pixels.
This feature was contributed by Marijn.