Currently, the Projects' editor support, when
creating the javax.swing.text.Document, inserts an
instance Project as a property to the docuemnt.
This is useful, because the EditorKit (which does
all the coloring and completion and stuff) can
then extract it and use it as context.

It would be useful if extracting the property was
supported by a utility method, e.g. 

public static Project getProject(Document doc) {...}

This would be analogous to what currently the
Editor module provides for DataObjects:

Class
org.netbeans.modules.editor.NbEditorUtilities
contains method

public static DataObject getDataObject(Document
doc) {...}