vim in tmux background color changes when paging

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As explained here, disable Background Color Erase (BCE) by clearing the t_ut terminal option (run :set t_ut= in Vim and then press Control+L to refresh the terminal’s display) so that color schemes work properly when Vim is used inside tmux and GNU screen.

Per the above link, BCE can be set in .vimrc by adding the following

if &term =~ '256color'
    " disable Background Color Erase (BCE) so that color schemes
    " render properly when inside 256-color tmux and GNU screen.
    " see also http://snk.tuxfamily.org/log/vim-256color-bce.html
    set t_ut=
endif

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