EditorApplication.SaveCurrentSceneIfUserWantsTo Manual     Reference     Scripting  
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static function SaveCurrentSceneIfUserWantsTo () : bool


Ask the user if he wants to save the open scene.

You might want to call this before opening another scene or creating a new scene. A return value of true indicates that you may continue. A return value of false indicates that the user cancelled the operation and you should not Open another Scene.