obtain current visual selection

Hello,

There is a thread on StackOverflow labelled

"How to get visually selected text in VimScript"

The naive and stable approach would be

let old_reg = @v
normal! gv"vy
let raw_search = @v
let @v = old_reg
return raw_search

but that only works if `set nosecure`. If `set secure` then
the functions become involved. I posted my own take at

http://stackoverflow.com/questions/1533565/how-to-get-visually-selected-text-in-vimscript/28398359#28398359

but it handles neither block-wise selections nor multibyte columns. A function that supports both is for example given at

https://github.com/haya14busa/vim-asterisk/blob/4fda3a4d90926512fbb10eda8b7b0491c650eb5e/autoload/asterisk.vim#L163

Is there a simple solution at all?

Enno

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