[Feature Request] Renaming Second Parameter from width to length in thumbnail operations

[AmitSonkhiya]

Hi,

Do you think if it would be better to rename the second parameter width to length in *thumbnail related methods?
For me, at the first glance, the name width in documents/code appears like the standard length in x axis strictly. And it misleads when the methods take higher side in consideration and create a 100x200px thumbnail for 400x800px vertical image when width = 200 is specified (with width = 200, it seems as a thumbnail with 200px length in x axis).

Thank you

[jcupitt]

We can't rename parameters in libvips without breaking API, so we can't make this change. The docs explain what the param means.