Цветовые схемы Vim не работают на экране GNU даже после установки .bashrc и .screenrc

Я установил для своих файлов .screenrc и .bashrc следующий ответ здесь: Странное поведение цвета vim внутри экрана с 256 цветами

Но цветовые схемы по-прежнему работают некорректно в GNU Screen. Если я не в GNU Screen, цветовые схемы идеальны, только в Screen.

Любые другие советы по устранению этой проблемы будут оценены!

Вот мои файлы bashrc, vimrc и screenrc...

.bashrc-файл

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples
export TERM=xterm-256color
# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color) color_prompt=yes;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
    # We have color support; assume it's compliant with Ecma-48
    # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
    # a case would tend to support setf rather than setaf.)
    color_prompt=yes
    else
    color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

export NVM_DIR="/home/serge/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm

файл .screenrc

# An alternative hardstatus to display a bar at the bottom listing the
# windownames and highlighting the current windowname in blue. (This is only
# enabled if there is no hardstatus setting for your terminal)
# hardstatus on
# hardstatus alwayslastline
# hardstatus string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a "
term screen-256color

.vimrc-файл

" use visual bell instead of beeping
"set vb
"   
" Basics {
set nocompatible " explicitly get out of vi-compatible mode

" i added this for colorshemes
"set term=xterm-256color

if $COLORTERM == 'gnome-terminal'
      set t_Co=256
  endif

syntax on
syntax enable
colorscheme twilight256
set background=dark "uncommented this & fixed the colorscheme issue


"let g:solarized_termcolors=256 " Added this for solarized

" General {
filetype plugin indent on " load filetype plugins/indent settings
set autochdir " always switch to the current file directory 
set backspace=indent,eol,start " make backspace a more flexible
set fileformats=unix,dos,mac " support all three, in this order
set iskeyword+=_,$,@,%,# " none of these are word dividers
set mouse=a " use mouse everywhere
set whichwrap=b,s,h,l,<,>,~,[,] " everything wraps
set wildmenu " turn on command line completion wild style

" Vim UI {
set laststatus=2 " always show the status line
set linespace=0 " don't insert any extra pixel lines betweens rows
set matchtime=5 " how many tenths of a second to blink matching brackets for
set novisualbell " don't blink
set number " turn on line numbers
set ruler " Always show current positions along the bottom
set showcmd " show the command being typed
set showmatch " show matching brackets
set statusline=%F%m%r%h%w[%L][%{&ff}]%y[%p%%][%04l,%04v]
nnoremap <C-N> :next<Enter> " this replaces :next, when opening multiple files
nnoremap <C-P> :prev<Enter> " this replaces :prev, when opening multiple files
set confirm

" Text Formatting/Layout {
set tabstop=4
set expandtab
set shiftwidth=4 " not sure what this does?
set smarttab autoindent
set softtabstop=4 " when hitting tab or backspace, how many spaces 


" paste mode - this will avoid unexpected effects when you
" cut or copy some text from one window and paste it in Vim.
set pastetoggle=<F2>

" The 3 commands below are an experiment
" save file (ctrl-s)
"   :map <C-s> :w<cr>
" copy selected text (ctrl-c)
"   :vmap <C-c> y
" Paste clipboard contents (ctrl-v)
"   :imap <C-p> <esc>P
  " Press i to enter insert mode, and ii to exit. 
:imap jj <Esc>
:inoremap <C-S> <C-O>:w<CR>


" Filetype-Dependent Settings
filetype plugin on
filetype indent on

set modifiable

" Pathogen related
execute pathogen#infect()
call pathogen#helptags()
syntax on
filetype plugin indent on

* РЕДАКТИРОВАТЬ: Хорошо, я кое-что сделал с файлом vimrc (я закомментировал «set background=dark» :/ ). Это исправило подсветку синтаксиса.

Но теперь цвет фона терминала сливается с цветом Vim. Вот скриншот двух: https://s24.postimg.org/i81kjz1cl/Screenshot_from_2017-06-04_18_47_55.png

Вот как должна выглядеть цветовая схема на экране gnu: https://s7.postimg.org/47fo5qd97/image.png

*Решение. Я обнаружил, что в мой файл .vimrc необходимо добавить следующий код. Это устранило проблему с фоном. Я пришел к решению из этого URL-адреса, комментарий https://stackoverflow.com/a/15279464/8110853. Вкратце, похоже, что опция t_ut в Vim «использует текущий цвет фона» только в том случае, если значение является непустой строкой, которая находится в xterm-256color, но не в screen-256color. Поэтому решение состоит в том, чтобы «очистить значение t_ut Vim, если Vim работает внутри любого 256-цветного терминала». Следующие коды, размещенные внутри .vimrc, делают это. Я поместил его в конец конца файла.

if &term =~ '256color' " disable Background Color Erase (BCE) so that color schemes " render properly when inside 256-color GNU screen. set t_ut= endif