fix for long url filenames (issue 538)

[vrinek]

#538

[vrinek]

I just realized something. The maximum filename size does not take into account the version name ("small", "large" etc) in the filename.

[vrinek]

it does not look good but it works :)

[bensie]

Thanks for your work here, but this is far too much of an edge case with too complicated a fix to merge to master. In most cases, a simple validation for the length of the filename is sufficient.

[guich-wo]

got same issue. not such an edge case

[obliviusm]

me too