A PhD student switches to another PhD program and writes an article based on an idea or proposal on which the PhD student has worked, but which was written by the former advisor.
The PhD student leaves in good terms, and then contacts 2-3 times the former advisor to know whether they are interested in contributing to the article, without never getting a response.
If the PhD student publishes said article, should a note be added to the acknowledgments mentioning something like "we would like to thank Dr. Smith for some of the ideas that generated this article"?
Note that none of the original proposal is part of this article but some similar ideas are mentioned.