Release67 integration review, issue 161367

Hi,

I'm going to integrate fix for issue #161367 to release67 clone.

Issue: http://www.netbeans.org/issues/show_bug.cgi?id=161367

Subject: [67cat] Scanning projects task never terminates

Impact assessment: Please ignore the subject as it does not reflect the
problem. This issue has morphed through several problems over the time,
because the reporters were not wiling to file separate issues for the
new problems that they discovered. Anyway, the last problem reported in
the issue is a performance problem affecting the usability of Netbeans
editor.  The IDE performed an unnecessary scan of a file when it was
opened in the editor, which delayed standard editor tasks that compute
for example code folds, navigator nodes, syntax colors, etc. Depending
on the file that you opened and its dependencies the delay could be tens
of seconds even on very fast machines. There was also a side effect of
this bug causing unnecessary redeployment of classes to an application
server, see http://www.netbeans.org/issues/show_bug.cgi?id=166188.

Risk assessment: In general any changes in this area are not safe, but
the fix was reviewed by several people and tested as much as development
could test it.

QE verification and peer revue: The reporters of both #161367 and
#166188 confirmed that the fix resolves their problems. The fix was peer
reviewed by several developers.

Fix: http://hg.netbeans.org/main-golden/rev/bbe2fbcd4d16

Thanks,
-vita