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I think automatic scanning should be disabled when suggestions view is not visible. My motivation is that when I'm writing the code, I often close suggestions view in hope to make editor respond faster. It's natural that heavy online parsing which is needed for suggestions functionality will add some overhead.
Scanning -should- be disabled when the suggestions view is not visible - there is a lot of code in there to ensure that, so if it's continuing to scan when the view is not visible I've broken something. I'll see if I can reproduce the problem. I wanted precisely the behavior you're describing: you only expose the suggestions view when you want to pay for the overhead of scanning.
Hmm, I think I have more information - javadoc auto commenter seems to be that bad guy who is still scanning while suggestions view is closed. It could be more clear from bug 30308, which I'm able to reproduce even when suggestions view is closed. Hope it helps...
I looked into it on the train this morning and found the problem. I was adding a listener on the DataObject registry (to be notified of file-saved). Then when the window is hidden I removed the listener. However, I had added a weaklistener, so the removeListener call wasn't sending in the same reference - therefore, the listener was not removed after hiding the window. Can you confirm that you were using scan-on-save, not scan-on-edit, mode? (Since my problem is specific to save-scanning). I have verified that when I hide the window and edit or save I don't see any further scanning. I will putback my fixes shortly.
It was resolved in 3.6 time or earlier.