[dev aug 25] <genlist> and <makenbm> are backwards. It is extremely
ugly that <genlist> searches for tasks of type <makenbm> and picks up
file lists from them--tasks should never do "magic" things like this.
It is also ugly that update tracking info is placed into
openide/update_tracking.xml, since openide is not really special, and
if you do incremental builds with different module configurations each
time you get incorrect results. The way it should work IMHO is that
<genlist> would be run once per possible NBM; it would generate an XML
file listing the files that go into just that NBM, stored somewhere
underneath the module (e.g. ${module}/netbeans_list/); <nbmerge> would
merge all available XML listing files together into one (just append
them all in some order); and the <makenbm> task instead of taking a
fileset would point to an already-made XML file list. Or some other
method that would put the definition of the updatable files in
<genlist> and have <makenbm> read that, so that it is not backwards.