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[ BUILD # : 051206 ] [ JDK VERSION : 1.5.0_04 ] usually users close IDE when there are some Tabs open , if the try to start IDE netxt time it will cost them some times until IDE could open those tabs. so , if ide close the open tabs on exit it will start faster next time.
I think you can close it by your own, it isn't usual to close all your opened stuff before rebooting. Users like reopn with the same stuff more, I guess.
I agree with mmirilovic, standard good UI should try to restore configuration and state of application - we don't have any plans to work on suggested feature, sorry.