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diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
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+" Tests for the undo tree.
+" Since this script is sourced we need to explicitly break changes up in
+" undo-able pieces. Do that by setting 'undolevels'.
+" Also tests :earlier and :later.
+
+source check.vim
+source screendump.vim
+
+func Test_undotree()
+ new
+
+ normal! Aabc
+ set ul=100
+ let d = undotree()
+ call assert_equal(1, d.seq_last)
+ call assert_equal(1, d.seq_cur)
+ call assert_equal(0, d.save_last)
+ call assert_equal(0, d.save_cur)
+ call assert_equal(1, len(d.entries))
+ call assert_equal(1, d.entries[0].newhead)
+ call assert_equal(1, d.entries[0].seq)
+ call assert_true(d.entries[0].time <= d.time_cur)
+
+ normal! Adef
+ set ul=100
+ let d = undotree()
+ call assert_equal(2, d.seq_last)
+ call assert_equal(2, d.seq_cur)
+ call assert_equal(0, d.save_last)
+ call assert_equal(0, d.save_cur)
+ call assert_equal(2, len(d.entries))
+ call assert_equal(1, d.entries[0].seq)
+ call assert_equal(1, d.entries[1].newhead)
+ call assert_equal(2, d.entries[1].seq)
+ call assert_true(d.entries[1].time <= d.time_cur)
+
+ undo
+ set ul=100
+ let d = undotree()
+ call assert_equal(2, d.seq_last)
+ call assert_equal(1, d.seq_cur)
+ call assert_equal(0, d.save_last)
+ call assert_equal(0, d.save_cur)
+ call assert_equal(2, len(d.entries))
+ call assert_equal(1, d.entries[0].seq)
+ call assert_equal(1, d.entries[1].curhead)
+ call assert_equal(1, d.entries[1].newhead)
+ call assert_equal(2, d.entries[1].seq)
+ call assert_true(d.entries[1].time == d.time_cur)
+
+ normal! Aghi
+ set ul=100
+ let d = undotree()
+ call assert_equal(3, d.seq_last)
+ call assert_equal(3, d.seq_cur)
+ call assert_equal(0, d.save_last)
+ call assert_equal(0, d.save_cur)
+ call assert_equal(2, len(d.entries))
+ call assert_equal(1, d.entries[0].seq)
+ call assert_equal(2, d.entries[1].alt[0].seq)
+ call assert_equal(1, d.entries[1].newhead)
+ call assert_equal(3, d.entries[1].seq)
+ call assert_true(d.entries[1].time <= d.time_cur)
+
+ undo
+ set ul=100
+ let d = undotree()
+ call assert_equal(3, d.seq_last)
+ call assert_equal(1, d.seq_cur)
+ call assert_equal(0, d.save_last)
+ call assert_equal(0, d.save_cur)
+ call assert_equal(2, len(d.entries))
+ call assert_equal(1, d.entries[0].seq)
+ call assert_equal(2, d.entries[1].alt[0].seq)
+ call assert_equal(1, d.entries[1].curhead)
+ call assert_equal(1, d.entries[1].newhead)
+ call assert_equal(3, d.entries[1].seq)
+ call assert_true(d.entries[1].time == d.time_cur)
+
+ w! Xtest
+ let d = undotree()
+ call assert_equal(1, d.save_cur)
+ call assert_equal(1, d.save_last)
+ call delete('Xtest')
+ bwipe! Xtest
+endfunc
+
+func FillBuffer()
+ for i in range(1,13)
+ put=i
+ " Set 'undolevels' to split undo.
+ exe "setg ul=" . &g:ul
+ endfor
+endfunc
+
+func Test_global_local_undolevels()
+ new one
+ set undolevels=5
+ call FillBuffer()
+ " will only undo the last 5 changes, end up with 13 - (5 + 1) = 7 lines
+ earlier 10
+ call assert_equal(5, &g:undolevels)
+ call assert_equal(-123456, &l:undolevels)
+ call assert_equal('7', getline('$'))
+
+ new two
+ setlocal undolevels=2
+ call FillBuffer()
+ " will only undo the last 2 changes, end up with 13 - (2 + 1) = 10 lines
+ earlier 10
+ call assert_equal(5, &g:undolevels)
+ call assert_equal(2, &l:undolevels)
+ call assert_equal('10', getline('$'))
+
+ setlocal ul=10
+ call assert_equal(5, &g:undolevels)
+ call assert_equal(10, &l:undolevels)
+
+ " Setting local value in "two" must not change local value in "one"
+ wincmd p
+ call assert_equal(5, &g:undolevels)
+ call assert_equal(-123456, &l:undolevels)
+
+ new three
+ setglobal ul=50
+ call assert_equal(50, &g:undolevels)
+ call assert_equal(-123456, &l:undolevels)
+
+ " Resetting the local 'undolevels' value to use the global value
+ setlocal undolevels=5
+ setlocal undolevels<
+ call assert_equal(-123456, &l:undolevels)
+
+ " Drop created windows
+ set ul&
+ new
+ only!
+endfunc
+
+func BackOne(expected)
+ call feedkeys('g-', 'xt')
+ call assert_equal(a:expected, getline(1))
+endfunc
+
+func Test_undo_del_chars()
+ " Setup a buffer without creating undo entries
+ new
+ set ul=-1
+ call setline(1, ['123-456'])
+ set ul=100
+ 1
+ call test_settime(100)
+
+ " Delete three characters and undo with g-
+ call feedkeys('x', 'xt')
+ call feedkeys('x', 'xt')
+ call feedkeys('x', 'xt')
+ call assert_equal('-456', getline(1))
+ call BackOne('3-456')
+ call BackOne('23-456')
+ call BackOne('123-456')
+ call assert_fails("BackOne('123-456')")
+
+ :" Delete three other characters and go back in time with g-
+ call feedkeys('$x', 'xt')
+ call feedkeys('x', 'xt')
+ call feedkeys('x', 'xt')
+ call assert_equal('123-', getline(1))
+ call test_settime(101)
+
+ call BackOne('123-4')
+ call BackOne('123-45')
+ " skips '123-456' because it's older
+ call BackOne('-456')
+ call BackOne('3-456')
+ call BackOne('23-456')
+ call BackOne('123-456')
+ call assert_fails("BackOne('123-456')")
+ normal 10g+
+ call assert_equal('123-', getline(1))
+
+ :" Jump two seconds and go some seconds forward and backward
+ call test_settime(103)
+ call feedkeys("Aa\<Esc>", 'xt')
+ call feedkeys("Ab\<Esc>", 'xt')
+ call feedkeys("Ac\<Esc>", 'xt')
+ call assert_equal('123-abc', getline(1))
+ earlier 1s
+ call assert_equal('123-', getline(1))
+ earlier 3s
+ call assert_equal('123-456', getline(1))
+ later 1s
+ call assert_equal('123-', getline(1))
+ later 1h
+ call assert_equal('123-abc', getline(1))
+
+ close!
+endfunc
+
+func Test_undolist()
+ new
+ set ul=100
+
+ let a = execute('undolist')
+ call assert_equal("\nNothing to undo", a)
+
+ " 1 leaf (2 changes).
+ call feedkeys('achange1', 'xt')
+ call feedkeys('achange2', 'xt')
+ let a = execute('undolist')
+ call assert_match("^\nnumber changes when *saved\n *2 *2 .*$", a)
+
+ " 2 leaves.
+ call feedkeys('u', 'xt')
+ call feedkeys('achange3\<Esc>', 'xt')
+ let a = execute('undolist')
+ call assert_match("^\nnumber changes when *saved\n *2 *2 *.*\n *3 *2 .*$", a)
+ close!
+endfunc
+
+func Test_U_command()
+ new
+ set ul=100
+ call feedkeys("achange1\<Esc>", 'xt')
+ call feedkeys("achange2\<Esc>", 'xt')
+ norm! U
+ call assert_equal('', getline(1))
+ norm! U
+ call assert_equal('change1change2', getline(1))
+ close!
+endfunc
+
+func Test_undojoin()
+ new
+ call feedkeys("Goaaaa\<Esc>", 'xt')
+ call feedkeys("obbbb\<Esc>", 'xt')
+ call assert_equal(['aaaa', 'bbbb'], getline(2, '$'))
+ call feedkeys("u", 'xt')
+ call assert_equal(['aaaa'], getline(2, '$'))
+ call feedkeys("obbbb\<Esc>", 'xt')
+ undojoin
+ " Note: next change must not be as if typed
+ call feedkeys("occcc\<Esc>", 'x')
+ call assert_equal(['aaaa', 'bbbb', 'cccc'], getline(2, '$'))
+ call feedkeys("u", 'xt')
+ call assert_equal(['aaaa'], getline(2, '$'))
+ bwipe!
+endfunc
+
+func Test_undojoin_redo()
+ new
+ call setline(1, ['first line', 'second line'])
+ call feedkeys("ixx\<Esc>", 'xt')
+ call feedkeys(":undojoin | redo\<CR>", 'xt')
+ call assert_equal('xxfirst line', getline(1))
+ call assert_equal('second line', getline(2))
+ bwipe!
+endfunc
+
+" undojoin not allowed after undo
+func Test_undojoin_after_undo()
+ new
+ call feedkeys("ixx\<Esc>u", 'xt')
+ call assert_fails(':undojoin', 'E790:')
+ bwipe!
+endfunc
+
+" undojoin is a noop when no change yet, or when 'undolevels' is negative
+func Test_undojoin_noop()
+ new
+ call feedkeys(":undojoin\<CR>", 'xt')
+ call assert_equal([''], getline(1, '$'))
+ setlocal undolevels=-1
+ call feedkeys("ixx\<Esc>u", 'xt')
+ call feedkeys(":undojoin\<CR>", 'xt')
+ call assert_equal(['xx'], getline(1, '$'))
+ bwipe!
+endfunc
+
+func Test_undo_write()
+ call delete('Xtest')
+ split Xtest
+ call feedkeys("ione one one\<Esc>", 'xt')
+ w!
+ call feedkeys("otwo\<Esc>", 'xt')
+ call feedkeys("otwo\<Esc>", 'xt')
+ w
+ call feedkeys("othree\<Esc>", 'xt')
+ call assert_equal(['one one one', 'two', 'two', 'three'], getline(1, '$'))
+ earlier 1f
+ call assert_equal(['one one one', 'two', 'two'], getline(1, '$'))
+ earlier 1f
+ call assert_equal(['one one one'], getline(1, '$'))
+ earlier 1f
+ call assert_equal([''], getline(1, '$'))
+ later 1f
+ call assert_equal(['one one one'], getline(1, '$'))
+ later 1f
+ call assert_equal(['one one one', 'two', 'two'], getline(1, '$'))
+ later 1f
+ call assert_equal(['one one one', 'two', 'two', 'three'], getline(1, '$'))
+
+ close!
+ call delete('Xtest')
+ bwipe! Xtest
+
+ call assert_fails('earlier xyz', 'E475:')
+endfunc
+
+func Test_insert_expr()
+ new
+ " calling setline() triggers undo sync
+ call feedkeys("oa\<Esc>", 'xt')
+ call feedkeys("ob\<Esc>", 'xt')
+ set ul=100
+ call feedkeys("o1\<Esc>a2\<C-R>=setline('.','1234')\<CR>\<CR>\<Esc>", 'x')
+ call assert_equal(['a', 'b', '120', '34'], getline(2, '$'))
+ call feedkeys("u", 'x')
+ call assert_equal(['a', 'b', '12'], getline(2, '$'))
+ call feedkeys("u", 'x')
+ call assert_equal(['a', 'b'], getline(2, '$'))
+
+ call feedkeys("oc\<Esc>", 'xt')
+ set ul=100
+ call feedkeys("o1\<Esc>a2\<C-R>=setline('.','1234')\<CR>\<CR>\<Esc>", 'x')
+ call assert_equal(['a', 'b', 'c', '120', '34'], getline(2, '$'))
+ call feedkeys("u", 'x')
+ call assert_equal(['a', 'b', 'c', '12'], getline(2, '$'))
+
+ call feedkeys("od\<Esc>", 'xt')
+ set ul=100
+ call feedkeys("o1\<Esc>a2\<C-R>=string(123)\<CR>\<Esc>", 'x')
+ call assert_equal(['a', 'b', 'c', '12', 'd', '12123'], getline(2, '$'))
+ call feedkeys("u", 'x')
+ call assert_equal(['a', 'b', 'c', '12', 'd'], getline(2, '$'))
+
+ close!
+endfunc
+
+func Test_undofile_earlier()
+ if has('win32')
+ " FIXME: This test is flaky on MS-Windows.
+ let g:test_is_flaky = 1
+ endif
+
+ " Issue #1254
+ " create undofile with timestamps older than Vim startup time.
+ let t0 = localtime() - 43200
+ call test_settime(t0)
+ new XfileEarlier
+ call feedkeys("ione\<Esc>", 'xt')
+ set ul=100
+ call test_settime(t0 + 1)
+ call feedkeys("otwo\<Esc>", 'xt')
+ set ul=100
+ call test_settime(t0 + 2)
+ call feedkeys("othree\<Esc>", 'xt')
+ set ul=100
+ w
+ wundo Xundofile
+ bwipe!
+ " restore normal timestamps.
+ call test_settime(0)
+ new XfileEarlier
+ rundo Xundofile
+ earlier 1d
+ call assert_equal('', getline(1))
+ bwipe!
+ call delete('XfileEarlier')
+ call delete('Xundofile')
+endfunc
+
+func Test_wundo_errors()
+ new
+ call setline(1, 'hello')
+ call assert_fails('wundo! Xdoesnotexist/Xundofile', 'E828:')
+ bwipe!
+endfunc
+
+" Check that reading a truncated undo file doesn't hang.
+func Test_undofile_truncated()
+ new
+ call setline(1, 'hello')
+ set ul=100
+ wundo Xundofile
+ let contents = readfile('Xundofile', 'B')
+
+ " try several sizes
+ for size in range(20, 500, 33)
+ call writefile(contents[0:size], 'Xundofile', 'D')
+ call assert_fails('rundo Xundofile', 'E825:')
+ endfor
+
+ bwipe!
+endfunc
+
+func Test_rundo_errors()
+ call assert_fails('rundo XfileDoesNotExist', 'E822:')
+
+ call writefile(['abc'], 'Xundofile', 'D')
+ call assert_fails('rundo Xundofile', 'E823:')
+endfunc
+
+func Test_undofile_next()
+ set undofile
+ new Xfoo.txt
+ execute "norm ix\<c-g>uy\<c-g>uz\<Esc>"
+ write
+ bwipe
+
+ next Xfoo.txt
+ call assert_equal('xyz', getline(1))
+ silent undo
+ call assert_equal('xy', getline(1))
+ silent undo
+ call assert_equal('x', getline(1))
+ bwipe!
+
+ call delete('Xfoo.txt')
+ call delete('.Xfoo.txt.un~')
+ set undofile&
+endfunc
+
+" Test for undo working properly when executing commands from a register.
+" Also test this in an empty buffer.
+func Test_cmd_in_reg_undo()
+ enew!
+ let @a = "Ox\<Esc>jAy\<Esc>kdd"
+ edit +/^$ test_undo.vim
+ normal @au
+ call assert_equal(0, &modified)
+ return
+ new
+ normal @au
+ call assert_equal(0, &modified)
+ only!
+ let @a = ''
+endfunc
+
+" This used to cause an illegal memory access
+func Test_undo_append()
+ new
+ call feedkeys("axx\<Esc>v", 'xt')
+ undo
+ norm o
+ quit
+endfunc
+
+func Test_undo_0()
+ new
+ set ul=100
+ normal i1
+ undo
+ normal i2
+ undo
+ normal i3
+
+ undo 0
+ let d = undotree()
+ call assert_equal('', getline(1))
+ call assert_equal(0, d.seq_cur)
+
+ redo
+ let d = undotree()
+ call assert_equal('3', getline(1))
+ call assert_equal(3, d.seq_cur)
+
+ undo 2
+ undo 0
+ let d = undotree()
+ call assert_equal('', getline(1))
+ call assert_equal(0, d.seq_cur)
+
+ redo
+ let d = undotree()
+ call assert_equal('2', getline(1))
+ call assert_equal(2, d.seq_cur)
+
+ undo 1
+ undo 0
+ let d = undotree()
+ call assert_equal('', getline(1))
+ call assert_equal(0, d.seq_cur)
+
+ redo
+ let d = undotree()
+ call assert_equal('1', getline(1))
+ call assert_equal(1, d.seq_cur)
+
+ bwipe!
+endfunc
+
+" undo or redo are noop if there is nothing to undo or redo
+func Test_undo_redo_noop()
+ new
+ call assert_fails('undo 2', 'E830:')
+
+ message clear
+ undo
+ let messages = split(execute('message'), "\n")
+ call assert_equal('Already at oldest change', messages[-1])
+
+ message clear
+ redo
+ let messages = split(execute('message'), "\n")
+ call assert_equal('Already at newest change', messages[-1])
+
+ bwipe!
+endfunc
+
+func Test_redo_empty_line()
+ new
+ exe "norm\x16r\x160"
+ exe "norm."
+ bwipe!
+endfunc
+
+funct Test_undofile()
+ " Test undofile() without setting 'undodir'.
+ if has('persistent_undo')
+ call assert_equal(fnamemodify('.Xundofoo.un~', ':p'), undofile('Xundofoo'))
+ else
+ call assert_equal('', undofile('Xundofoo'))
+ endif
+ call assert_equal('', undofile(''))
+
+ " Test undofile() with 'undodir' set to to an existing directory.
+ call mkdir('Xundodir')
+ set undodir=Xundodir
+ let cwd = getcwd()
+ if has('win32')
+ " Replace windows drive such as C:... into C%...
+ let cwd = substitute(cwd, '^\([a-zA-Z]\):', '\1%', 'g')
+ endif
+ let cwd = substitute(cwd . '/Xundofoo', '/', '%', 'g')
+ if has('persistent_undo')
+ call assert_equal('Xundodir/' . cwd, undofile('Xundofoo'))
+ else
+ call assert_equal('', undofile('Xundofoo'))
+ endif
+ call assert_equal('', undofile(''))
+ call delete('Xundodir', 'd')
+
+ " Test undofile() with 'undodir' set to a non-existing directory.
+ call assert_equal('', 'Xundofoo'->undofile())
+
+ if !has('win32') && isdirectory('/tmp')
+ set undodir=/tmp
+ if has('osx')
+ call assert_equal('/tmp/%private%tmp%file', undofile('///tmp/file'))
+ else
+ call assert_equal('/tmp/%tmp%file', undofile('///tmp/file'))
+ endif
+ endif
+
+ set undodir&
+endfunc
+
+" Tests for the undo file
+" Explicitly break changes up in undo-able pieces by setting 'undolevels'.
+func Test_undofile_2()
+ set undolevels=100 undofile
+ edit Xtestfile
+ call append(0, 'this is one line')
+ call cursor(1, 1)
+
+ " first a simple one-line change.
+ set undolevels=100
+ s/one/ONE/
+ set undolevels=100
+ write
+ bwipe!
+ edit Xtestfile
+ undo
+ call assert_equal('this is one line', getline(1))
+
+ " change in original file fails check
+ set noundofile
+ edit! Xtestfile
+ s/line/Line/
+ write
+ set undofile
+ bwipe!
+ edit Xtestfile
+ undo
+ call assert_equal('this is ONE Line', getline(1))
+
+ " add 10 lines, delete 6 lines, undo 3
+ set undofile
+ call setbufline('%', 1, ['one', 'two', 'three', 'four', 'five', 'six',
+ \ 'seven', 'eight', 'nine', 'ten'])
+ set undolevels=100
+ normal 3Gdd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ write
+ bwipe!
+ edit Xtestfile
+ normal uuu
+ call assert_equal(['one', 'two', 'six', 'seven', 'eight', 'nine', 'ten'],
+ \ getline(1, '$'))
+
+ " Test that reading the undofiles when setting undofile works
+ set noundofile undolevels=0
+ exe "normal i\n"
+ undo
+ edit! Xtestfile
+ set undofile undolevels=100
+ normal uuuuuu
+ call assert_equal(['one', 'two', 'three', 'four', 'five', 'six', 'seven',
+ \ 'eight', 'nine', 'ten'], getline(1, '$'))
+
+ bwipe!
+ call delete('Xtestfile')
+ let ufile = has('vms') ? '_un_Xtestfile' : '.Xtestfile.un~'
+ call delete(ufile)
+ set undofile& undolevels&
+endfunc
+
+" Test 'undofile' using a file encrypted with 'zip' crypt method
+func Test_undofile_cryptmethod_zip()
+ edit Xtestfile
+ set undofile cryptmethod=zip
+ call append(0, ['monday', 'tuesday', 'wednesday', 'thursday', 'friday'])
+ call cursor(5, 1)
+
+ set undolevels=100
+ normal kkkdd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ " encrypt the file using key 'foobar'
+ call feedkeys("foobar\nfoobar\n")
+ X
+ write!
+ bwipe!
+
+ call feedkeys("foobar\n")
+ edit Xtestfile
+ set key=
+ normal uu
+ call assert_equal(['monday', 'wednesday', 'thursday', 'friday', ''],
+ \ getline(1, '$'))
+
+ bwipe!
+ call delete('Xtestfile')
+ let ufile = has('vms') ? '_un_Xtestfile' : '.Xtestfile.un~'
+ call delete(ufile)
+ set undofile& undolevels& cryptmethod&
+endfunc
+
+" Test 'undofile' using a file encrypted with 'blowfish' crypt method
+func Test_undofile_cryptmethod_blowfish()
+ edit Xtestfile
+ set undofile cryptmethod=blowfish
+ call append(0, ['jan', 'feb', 'mar', 'apr', 'jun'])
+ call cursor(5, 1)
+
+ set undolevels=100
+ exe 'normal kk0ifoo '
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ exe 'normal ibar '
+ set undolevels=100
+ " encrypt the file using key 'foobar'
+ call feedkeys("foobar\nfoobar\n")
+ X
+ write!
+ bwipe!
+
+ call feedkeys("foobar\n")
+ edit Xtestfile
+ set key=
+ call search('bar')
+ call assert_equal('bar apr', getline('.'))
+ undo
+ call assert_equal('apr', getline('.'))
+ undo
+ call assert_equal('foo mar', getline('.'))
+ undo
+ call assert_equal('mar', getline('.'))
+
+ bwipe!
+ call delete('Xtestfile')
+ let ufile = has('vms') ? '_un_Xtestfile' : '.Xtestfile.un~'
+ call delete(ufile)
+ set undofile& undolevels& cryptmethod&
+endfunc
+
+" Test 'undofile' using a file encrypted with 'blowfish2' crypt method
+func Test_undofile_cryptmethod_blowfish2()
+ edit Xtestfile
+ set undofile cryptmethod=blowfish2
+ call append(0, ['jan', 'feb', 'mar', 'apr', 'jun'])
+ call cursor(5, 1)
+
+ set undolevels=100
+ exe 'normal kk0ifoo '
+ set undolevels=100
+ normal dd
+ set undolevels=100
+ exe 'normal ibar '
+ set undolevels=100
+ " encrypt the file using key 'foo2bar'
+ call feedkeys("foo2bar\nfoo2bar\n")
+ X
+ write!
+ bwipe!
+
+ call feedkeys("foo2bar\n")
+ edit Xtestfile
+ set key=
+ call search('bar')
+ call assert_equal('bar apr', getline('.'))
+ normal u
+ call assert_equal('apr', getline('.'))
+ normal u
+ call assert_equal('foo mar', getline('.'))
+ normal u
+ call assert_equal('mar', getline('.'))
+
+ bwipe!
+ call delete('Xtestfile')
+ let ufile = has('vms') ? '_un_Xtestfile' : '.Xtestfile.un~'
+ call delete(ufile)
+ set undofile& undolevels& cryptmethod&
+endfunc
+
+" Test for redoing with incrementing numbered registers
+func Test_redo_repeat_numbered_register()
+ new
+ for [i, v] in [[1, 'one'], [2, 'two'], [3, 'three'],
+ \ [4, 'four'], [5, 'five'], [6, 'six'],
+ \ [7, 'seven'], [8, 'eight'], [9, 'nine']]
+ exe 'let @' .. i .. '="' .. v .. '\n"'
+ endfor
+ call feedkeys('"1p.........', 'xt')
+ call assert_equal(['', 'one', 'two', 'three', 'four', 'five', 'six',
+ \ 'seven', 'eight', 'nine', 'nine'], getline(1, '$'))
+ bwipe!
+endfunc
+
+" Test for redo in insert mode using CTRL-O with multibyte characters
+func Test_redo_multibyte_in_insert_mode()
+ new
+ call feedkeys("a\<C-K>ft", 'xt')
+ call feedkeys("uiHe\<C-O>.llo", 'xt')
+ call assert_equal("He\ufb05llo", getline(1))
+ bwipe!
+endfunc
+
+func Test_undo_mark()
+ new
+ " The undo is applied to the only line.
+ call setline(1, 'hello')
+ call feedkeys("ggyiw$p", 'xt')
+ undo
+ call assert_equal([0, 1, 1, 0], getpos("'["))
+ call assert_equal([0, 1, 1, 0], getpos("']"))
+ " The undo removes the last line.
+ call feedkeys("Goaaaa\<Esc>", 'xt')
+ call feedkeys("obbbb\<Esc>", 'xt')
+ undo
+ call assert_equal([0, 2, 1, 0], getpos("'["))
+ call assert_equal([0, 2, 1, 0], getpos("']"))
+ bwipe!
+endfunc
+
+func Test_undo_after_write()
+ " use a terminal to make undo work like when text is typed
+ CheckRunVimInTerminal
+
+ let lines =<< trim END
+ edit Xtestfile.txt
+ set undolevels=100 undofile
+ imap . <Cmd>write<CR>
+ write
+ END
+ call writefile(lines, 'Xtest_undo_after_write', 'D')
+ let buf = RunVimInTerminal('-S Xtest_undo_after_write', #{rows: 6})
+
+ call term_sendkeys(buf, "Otest.\<CR>boo!!!\<Esc>")
+ sleep 100m
+ call term_sendkeys(buf, "u")
+ call VerifyScreenDump(buf, 'Test_undo_after_write_1', {})
+
+ call term_sendkeys(buf, "u")
+ call VerifyScreenDump(buf, 'Test_undo_after_write_2', {})
+
+ call StopVimInTerminal(buf)
+ call delete('Xtestfile.txt')
+endfunc
+
+
+" vim: shiftwidth=2 sts=2 expandtab
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-12 08:45:12 +0000