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I have disabled auto popup of the over-eager completion window. When I restart Netbeans, the completion window WILL pop up automatically while in the Javascript editor. To make it stop, I have to go into editor options, check and re-uncheck this option. I have to do this every time I start Netbeans.
The persistence of the auto popup setting should be fixed by Vita's editor settings rewrite (issue 90403). In the current version, the setting didn't seem to be consulted at all, so I added some code to GsfCompletionProvider to check the setting and turn off the auto popup when it's been turned off. This is in changeset f50fe69cf2a7.