Size of this preview: 337 × 599 pixels. Other resolutions: … 337 × 600 pixels …
However both …599 and …600 hyperlink to the same file!
And which resolution is it? Testing shows: 599!
Therefore there is in fact no "other resolution 337 × 600 pixels". It should be
eliminated from the list!
(Let's assume the bug is due to some tough-to-solve numerical rounding
error. OK, no problem. Just, when composing the list, simply compare the
filenames of each list candidate with the filename of the default
thumbnail. If there is an exact match, just don't add it to the list.)
Same exact bug occurs also on