[gdal-dev] Discrepancy in utilizing overviews with gdalwarp

[Denis Rykov]

I'd anticipate that both commands would yield the same outcome:

$ gdalwarp -oo OVERVIEW_LEVEL=1 -dstalpha input.vrt ovr1.tif
$ gdalwarp -ovr 1 -dstalpha input.vrt ovr1.tif

However, the reality is different. The first command behaves as intended,
utilizing overviews from *.vrt.ovr, while the second command operates
noticeably slower, seemingly disregarding the overviews.
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