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It would be nice to automatically show method parameters tooltip when caret is between brackets. It will save some time because no ctrl+p will be needed in this case. Very often I don't choose anything from the auto-complete list (I believe that I'm not alone), and in this case tooltip will never be shown (unless you press ctrl+p).
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss
I will close it, because it will handled now at the JIRA board: https://issues.apache.org/jira/browse/NETBEANS-380. Please discuss it there for further information.