confirmation before closing the create category window

[mrjoe3012]

Upon my first time using this app, I spent quite a lot of time trying to create a category for pose keypoints and linking everything up. At one point I accidentally clicked off of the create a category window and it closed with no confirmation.

I think either disabling the feature that closes the window when the user clicks somewhere else, or adding a confirmation dialogue if there are unsaved changed would be a good addition.