what is idea of queryFormat()

[AndreiCherniaev]

https://github.com/mpromonet/libv4l2cpp/blob/fac4b836b556f6befc55663f2aa1d6577fbabb8a/src/V4l2Device.cpp#L59

function configureFormat() calls to get current configuration. But I want to say it is not current but it is old configuration. For example I use application qv4l2, set in this application some not good settings and close it. Library libv4l2cpp do first of all read this settings e.g. incorrect m_bufferSize. I want to say more. libv4l2cpp will use not correct m_bufferSize from another application. What is reason to do it?