Thanks for inquiring Aspose.Slides.
I have observed your requirements and like to share that text frame holds the text inside shape of presentation. Aspose.Slides offer TextFrameFormat.AutofitType Property that allows you set the TextAutofit type to either shape or Normal. The Shape autofit property, changes shape size fit the text. Where as Normal autofit type reduced the text font size to accommodate that in given shape boundaries. There is no such property to tell if the text has overflown the shape. Can you please share the sample presentation along with what you want to achieve so that I may investigate further to help you out.
I have tried opening the presentation file shared by you and have opened that in PowerPoint. I am unable to get your requirement from presentation and in attached image can you please share where you actually want to map your requirement. Moreover, based on your comments, what I have perceived is some thing like shared in this image. Is this what you want to know if the text frame text has exceeded shape or not? If this is requirement then I like to mention that there is no such support available in this regard. I have also discussed this with our product team in this regard and will share further feedback with you after feedback is being shared by them.
We are sorry for your inconvenience,
can i get Range object or Characters of any TextFrame in Java 8
I have tried to understand your requirements and have not been able to completely understand that. If you want to access or extract TextFrame text, then I suggest you to please visit documentation article, Replacing TextFrame text.