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sam marshall authored
The mtrace function is preferable for plain text logging/progress output because it can be redirected if necessary. By convention it is normally used in cron and can be used in CLI tasks if required. This change makes the text_progress_trace class use mtrace instead of echo and then flush. (Default behaviour of mtrace is to do exactly that, but it can be redirected too.) Before this change, if anybody is relying on mtrace behaviour to redirect logs of cron output, this will fail for some parts of the search cron output (and some other places like auth plugins).
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