fix substitution in visual block mode
fix substitution in visual block mode

westim/Vim,rufusroflpunch/Vim,Chillee/VSCodeNeovim,rufusroflpunch/Vim,westim/Vim,Chillee/VSCodeNeovim,Chillee/Vim,VSCodeVim/Vim,VSCodeVim/Vim,Chillee/VSCodeNeovim,Chillee/Vim,westim/Vim