To avoid infinite recursion, Qt prevents a log generated from an installed
message handler from being handled by that same handler. So when a Qt message
is handled, the logging magic (__logging_message__) that is added by
CreateLogger, and is expected to be detected and stripped by the handler, is
instead dumped to the log.
Instead of sending the Qt messages back through the logging system, use a new
BufferedDebug to build the log message in a buffer, then immeiately print the
buffer to stderr.
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