Comment 1 for bug 1664151

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Daniel van Vugt (vanvugt) wrote : Re: [performance] unity8.log flooded with debug messages about cursor position and appearance

According to the source code, the debug messages come from:
  DEBUG_MSG
which calls:
  qCDebug(QTMIR_SURFACES).nospace()

So that sounds reasonable. It would appear at some point we will need to define QT_NO_DEBUG_OUTPUT during QtMir builds to stop excess debug messages in release binaries. Or to remove any truly excessive debug messages like those above which can appear on simple cursor movements.