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BAboutWindow returned false in QuitRequested in order to hide instead of closing. Not only this keeps a BLooper running for a rarely used window, but it also prevents quitting an application in the window was not destroyed first. * Remove aforementioned QuitRequested method, * Add a static GetWindow method that returns the existing about window, if there is one, or creates one if there is not. A boolean can be set to tell the caller what happened, * Adjust all callers to use that new method, instead of managing the window themselves.