Debug output may appear two times

When I use QtCreator to run android apps, sometimes the debug output line written by qDebug() will appear two times in QtCreator's Application Output panel.
I think the problem is caused by AndroidRunner::logcatReadStandardOutput(), in that function it will remember the last line of logcat output if the output ends with '\n', and next time it will prepend the last line of the previous output to the new logcat output, then the line will be output twice.