"There was a typo in "int setNotifyOffset()", appear to be a getter =>
"int getNotifyOffset()".
Then I have added a switch to create GDALTermProgress only when the
current notify level + local offset permit message display. In fact, if
the offset is set to 0 and the notify level is at the default, DataSet
is quiet but for the GDALTermProgress. That is quite disturbing since
you think the progress is related to the complete processing but it is
actually only related to the GDAL Warp."