trailing spaces when copying text from vim session in one server to vim session in another server

Question

I have two windows open in tmux(version 2.3). In first tmux window I have a SSH session to server1 and in second tmux window I have a SSH session to server2. In server1 I opened a shell script with vim script.sh and selected a part of the script with mouse and paste it to vim open in server2 with middle mouse button. This caused lot of trailing spaces for each line:

However, when I open script.sh in server1 with vim -u NONE script.sh(or with cat script.sh or less script.sh) and select the same text area and past it to vim in server2, then trailing spaces are not added:

This made me think that something in my .vimrc causes this behavior. My .vimrc is following:

set relativenumber
set number
syntax on
set hls
set background=dark
set hidden
set listchars=tab:▸\ ,eol:↲,trail:·
highlight NonText guifg=#054a59
highlight SpecialKey guifg=#4a4a59
set noexpandtab
set shiftwidth=4
set tabstop=4
set softtabstop=4
set colorcolumn=81
  filetype on
  filetype plugin on
  filetype indent on
  autocmd FileType cpp setlocal ts=8 sts=8 sw=8 noexpandtab
  autocmd FileType * set formatoptions-=c formatoptions-=r formatoptions-=o
  autocmd BufNewFile,BufReadPost *.bash set filetype=sh
endif

I tried to turn every possible option off(for example set syntax=, set hidden!, set colorcolumn=, etc), but this did not help.

I know that copying and pasting from terminal screen is not reliable, but is there some clever workaround for this?

Answer 1

This behavior was caused by colorcolumn option. I started to use quoteplus register.