commit https://github.com/vim/vim/commit/ea3f2e7be447a8f0c4436869620f908de5e8ef1e Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jul 10 20:27:32 2016 +0200 patch 7.4.2023 Problem: buflist_findname_stat() may find a dummy buffer. Solution: Set the BF_DUMMY flag after loading a dummy buffer. Start finding buffers from the end of the list.

" Tests for Visual mode
if !has('multi_byte')
  finish
endif
set encoding=utf-8
scriptencoding utf-8

if !has('visual')
  finish
endif

func Test_block_shift_multibyte()
  split
  call setline(1, ['xヹxxx', 'ヹxxx'])
  exe "normal 1G0l\<C-V>jl>"
  call assert_equal('x	 ヹxxx', getline(1))
  call assert_equal('	ヹxxx', getline(2))
  q!
endfunc