[bug] undotree become empty

[Freed-Wu]

" $ uname -r
" 5.13.13-arch1-1
" $ has nvim
" ✓ nvim 0.5.0
" $ cat test.vim
set runtimepath=$VIMRUNTIME
set runtimepath+=~/.local/share/nvim/repos/github.com/mbbill/undotree
set undofile
autocmd VimEnter * UndotreeShow
" $ vi -u test.vim one_file_has_undo_histories.

Press <C-w>o

Press :UndotreeShow<CR>

The undotree is empty!

[mbbill]

the tree should show up once you move the focus to the right side

[Freed-Wu]

the tree should show up once you move the focus to the right side

Thanks.

When I UndotreeShow firstly, the cursor is in the current buffer and the
undotree display. However, when I UndotreeShow secondly, the cursor moves to
the undotree buffer? This is why?

[mbbill]

I'm not exactly sure, but I guess it might be related to how VIM handles the 'previous window'.

[Freed-Wu]

So it is a bug of (n)vim? 😄

[RayZ0rr]

Also, experiencing this bug.

Closing undotree window with q shows no bug. However closing undotree with :q or ZQ shows this behavior.

[EtiamNullam]

So it is a bug of (n)vim? 😄

@Freed-Wu: I can replicate it in vim 8.1

@RayZ0rr: Good catch!

[EtiamNullam]

I made this hack in lua for neovim as a workaround:

local function enter_undotree()
    vim.api.nvim_command('UndotreeShow')

    local is_glitched = vim.fn.getreg('%') == 'undotree_2'

    if is_glitched then
        vim.api.nvim_command [[
            wincmd w
            wincmd w
            wincmd p
        ]]
    else
        vim.api.nvim_command('UndotreeFocus')
    end
end