Add to .vimrc:
nnoremap <silent> = V`]=
Now, press = after pasting code.
you can use:
which reselect last select or paste.
Also, I'm not sure if I would like to have = remapped, gv= is still ok for me :)
I was wrong. gv will work only if p or P was used in visual mode.
I've got another mapping in my .vimrc:
noremap gV `[v`]
It would select last edited/pasted lines, so you can use gV=