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DrWhoCares
It may be more beneficial to add a prompt to ask whether or not you actually want to cancel the operation and close, rather than closing the window and waiting...
Quick google search brought up this page which might have some relevant information for you. https://gist.github.com/gmolveau/a802ded1320a7591a289fb7abd0d6c45 Not sure if it applies, but it might help.