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As described in #174707 I was having problems with reliability of printfs. One suggestion was to use System.err or even the Logging infrastructure directly. Instead of changing many calls to System.out.printf() instead will introduce Log.printf() that way changing the actual output mechanism will be trivial.
partially fixed in t-common. This needs to be done in t-common as well as dbxgui proper. By rights this requires an update of shelf.zip but there's no semantic or API changes so postponing that.
not for aten