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From what I understand, the editor would create a new copyright for what she created (introduction, notes, etc., if any), but as pdurrant says, not the material she edited, which has the copyright it would have, had it been simply posthumously published unedited.
Now, a posthumously published work may have a copyright different from a work published in the author's lifetime, but that is typically a shorter term, counting from the year it was first published. So, in your case, I'd assume the work to be public domain (in life+70 countries) since 1995 (1924+1+70), or 1996 at most.
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