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It appears there are different environment variables for GTK apps, KDE apps, and Electron apps, as well as additional different environment variables for *text* scaling rather than *display* scaling. Are docs for all of these various flags aggregated in one place?

This is one of those questions where I check Google and it's not so much that I don't find an answer but rather that I get many different answers, some contradictory, some seemingly situation-specific, and some possibly outdated.