I just passed about 2h on a server with mouse support enabled for #vim. This is my personal record. Couldn't stand it anymore and:

$ echo '" https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864074#95
" https://lists.debian.org/debian-user/2002/07/msg05649.html
runtime! defaults.vim
let g:skip_defaults_vim = 1
:filetype plugin indent off
:filetype plugin off

" disable mouse
set mouse=

set cmdheight=1
set nobk
set nocp

set showcmd
set showmatch
set autowrite

" set expandtab
set tabstop=4
' > /etc/vim/vimrc.local