NB: This is not referring to simply correcting misquoted text or typos.
The answer to this question contains a paragraph quoted from "The Classical Tradition" (by Grafton, Anthony, Glenn W. Most, and Salvatore Settis) that listed a number of military academies including the École Polytechnique in Paris.
This was recently edited because the editor believed that "The Ecole Polytechnique does not aim anymore to train officers. The Ecole Spéciale Militaire de Saint Cyr is the one responsible for it." and the original text was replaced with the new institution. While this edit may genuinely be correcting a factual error in the quote, I don't believe that a quoted text should be edited in this manner as it means the quote is no longer a true representation of the source material. I rejected the edit for this reason but others accepted it and the edit went ahead.
Surely there is a better way to highlight/correct factual errors in quoted material than editing the quote itself?