Bug 177328 - end-tag CC should be closed when user continues to type

https://netbeans.org/bugzilla/show_bug.cgi?id=177328

Description: When an user types an open tag or completes it via 
completion, then completion opens and offers the matching end tag. If 
user continues typing, the completion popup keeps opened. After pressing 
enter the completion item is completed but to the original position 
(when first opened) and the typed text is removed.

Impact: This is very annoying since user needs to press ESC key every 
time he types and open tag and do not immediately complete the offered 
end tag.

Cause: The HtmlCompletionProvider keeps the last query results incorrectly.

Changeset: http://hg.netbeans.org/web-main/rev/39bec099eee6

Already reviewed by Dusan Balek.

Thanks for the review,
Marek