Re-enable _printChanges() for previews
#1917
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For optimization reasons,
Reducer._printChanges()'s isn't generating output for Xcode previews (#1625).The new beta version of Xcode 14.3 now displays
Swift.print(…)messages in the console under the "previews" tab, so we should probably revert the changes from #1625 and re-enable_printChanges()'s output inpreviewcontext.I don't think there is a way to detect when previews are reloaded, so the output of successive reloads concatenates. It's better than nothing I guess, but this can maybe be improved in a subsequent PR.