Vsvim: detect vsvim in .vimrc file

VsVim doesn't support arbitrary Vim plugins and is unlikely to work with incsearch.

ok, but how I can detect that it's running in vsvim? I intend to exclude this mapping from .vimrc by

if !has("vsvim")
    "aditional mapping for incsearch
   map /  <Plug>(incsearch-forward)
   map ?  <Plug>(incsearch-backward)
   map g/ <Plug>(incsearch-stay)
endif

You could simply copy your .vimrc to .vsvimrc and omit the parts not working in VsVim.

That is the recommended practice.

is copypaste recommended ? i haven't known that it can be recommended.

Generally I structure my files as follows:

1. .vimcommon: all my settings common to VsVim and gVim
2. .vsvimrc: runs :source on the common file
3. .vimrc: runs :source on the common file then does gVim specific work.

Great, thanks! It's a better solution, I'll follow that.