Fix Imports command fails to work correctly for Groovy files.

To see the bug:

Create a new Java Application.

Create a new Groovy Class.

Enter the line:

Color color = new Color()

Fix imports.

It will correctly insert 
import java.awt.Color

Now, add the line:

Line line = new Line()

Fix Imports.

It will now incorrectly change the imports to be:

import java.awt.Color
import java.awt.Color
import javax.sound.sampled.Line

This effect is cumulative, and goes between files.  It will last until you restart the IDE.  

This may seem on reading to be a minor bug.  It is not.  It effectively means that Fix Imports cannot be used in Groovy, which is a major impediment to development.  This one bug made me switch development on my project to IntelliJ - which is too bad, since I'm trying to integrate JavaFX and Groovy, and Netbeans is much better for that purpose.