Feature Request: Nexus to show warning before exiting

Currently Nexus exits the program when commanded to do so (File/Exit or using the X button) without any warning or saving a draft of changes. A quick pop-up warning window to confirm exiting and/or remind saving changes will be helpful as it is the norm with many software. Majority of users are also quite accustomed to receiving such warnings and a quick exit will surprise many and loss of the edits to the XML will be frustrating.