#177306 - Eager CSS CC

https://netbeans.org/bugzilla/show_bug.cgi?id=177306

Description:
CSS code completion opens too often and sometimes even prevent users to 
type the wished text

- usecase 1:
  type in a .html: <style>|
  now if I want to type \n I have to close the CC window

- usecase 2:
  want to press Tab twice in a .css but cannot because the CC window 
stops me

Justification:
Annoying issue, disturbs users too much

Fix:
Restrict the situation when the code completion is automatically opened 
to the case when user types space in a css code except comments.

Risk:
Almost none, the fix is safe

Changeset:
http://hg.netbeans.org/web-main/rev/0589b03ab00b

Thanks for the review,
Marek