How is “a change of heart” used?

In Who Framed Roger Rabbit (1988), one line is: “-What'd you have, a change of heart? -Nothing's changed.”

Which movie is “a change of heart” from?

The clip at the top of this page is from Who Framed Roger Rabbit (1988).

-What'd you have, a change of heart? -Nothing's changed.

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if you have a change of heart, your attitude towards sth changes, usually making you feel more friendly, helpful, etc.

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if you have a change of heart, your attitude towards sth changes, usually making you feel more friendly, helpful, etc.
Even I couldn't predict he'd be the one to have a change of heart.

定義：Oxford Advanced Learner's Dictionary 第 9 版