Fixed guidelines when rotating image

[zio3d]

Thanks rich2005 for your info. I had previously used the "measure tool" command but never noticed the "Straighten" button. Very useful video .
Same thing for the path(s), I hardly knew them and I never investigated them. So you gave me the chance.

Thanks also to Ofnuts, I've always used rotation in normal mode and never corrective, I didn't even know it was there. It turns out very useful .