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As far as I know, no. Mac OS never had that environment variable at all since dark mode and live switching of dark to light was part of Qt on mac for years.
Qt for Windows, until recent versions, did not support true system dark mode or live switching so Sigil created its own. But now that true Windows dark mode and live switching is supported in Qt, we changed to use it. Trying to support it and our classic dark mode theme made forcing it on via environment variable a problem.
So the environment variable, stop-gap solution for Windows was removed in favour to what Windows and Qt uses..
DiapDealer should be able to answer more or maybe explain it better.
As a Mac user, it was not something I dealt with at all.
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