Thanks! I've also only heard it pronounced that way in real life. In the movie it's -line and the movie is based on a book where apparently that pronunciation is made clear (by making it rhyme with things) so maybe the -line pronunciation was used after that from time to time? But I still don't think it ever got common. I'm just so confused because in the comment section for
Madeline there seem to be lots of people who insist that -line is the only correct way to pronounce it. I wonder where they got that idea from because this doesn't seem to be the case. I should do a survey on this.