Bug 32210

In the tasklist module I frequently obtain a Line
object for various lines in files that I process.
I sometimes use the Line object to show the line,
or attach an annotation to it, and even showing
the filename and line number corresponding to the
Line.

But every now and then I've encountered some weird
problems after scanning an entire directory tree.

Today I tracked it down and figured out why: for
(some?) Bundle.properties files, the Line object
I'm given from Line.Set.getCurrent(), will return
null when I call getDataObject on it!!! 

I tried backtracking into the org.openide.text
package to see what's causing it, and saw method
names like getDataObjectHack(), so apparently this
is a shaky area. But I've never seen the problem
for regular java data objects (or html data
objects or xml data objects), so I think this is
specific to the properties data object.

If you need help reproducing this: select some
directory which contains a Bundle.properties file
which has a copyright that does not include the
current year; then in the Tools menu select Scan
Directory for Suggestions (you'll need the
tasklist modules installed for this). Now look in
the Copyright Problems section for an entry where
the filename is "null".