Statusline hidden if cmdheight = 0

[Shihua Zeng]

Description

The statuslines at the bottom (not all statusline, only the statuslines of the bottom windows) is not shown when image.nvim is loaded.

Minimal repro config

local tmp = '/tmp'
local data = tmp .. '/' .. (vim.env.NVIM_APPNAME or 'nvim')
local package_root = data .. '/site'
local clone_root = package_root .. '/pack/packages/start'
local clone_info = {
  {
    path = clone_root .. '/image.nvim',
    url = 'https://github.com/3rd/image.nvim.git',
  },
}

vim.fn.mkdir(clone_root, 'p')
vim.opt.pp:prepend(package_root)
vim.opt.rtp:prepend(package_root)
vim.opt.mousemoveevent = true

for _, info in ipairs(clone_info) do
  if not vim.loop.fs_stat(info.path) then
    vim.notify('cloning ' .. info.url, vim.log.levels.INFO)
    vim.fn.system({ 'git', 'clone', info.url, info.path })
  end
end

package.path = package.path
  .. ';'
  .. vim.fn.expand('$HOME')
  .. '/.luarocks/share/lua/5.1/?/init.lua;'
package.path = package.path
  .. ';'
  .. vim.fn.expand('$HOME')
  .. '/.luarocks/share/lua/5.1/?.lua;'

vim.opt.cmdheight = 0
vim.opt.number = true
vim.opt.conceallevel = 2
vim.opt.winbar = 'image.nvim demo'
vim.opt.signcolumn = 'yes:2'

require('image').setup({
  backend = 'ueberzug',
  window_overlap_clear_enabled = true,
  tmux_show_only_in_active_window = true,
  window_overlap_clear_ft_ignore = {},
  max_width = 80,
  max_height = 12,
  max_width_window_percentage = math.huge,
  max_height_window_percentage = math.huge,
})

local content = [[
# Hello World

![This is a remote image](https://gist.ro/s/remote.png)
]]

vim.schedule(function()
  local buf = vim.api.nvim_create_buf(false, true)
  vim.api.nvim_buf_set_lines(buf, 0, -1, true, vim.split(content, '\n'))
  vim.api.nvim_buf_set_option(buf, 'filetype', 'markdown')
  vim.api.nvim_set_current_buf(buf)
  vim.cmd('split')
end)

Steps to repro

1. Save the above as minimal.lua
2. nvim --clean -u minimal.lua
3. See how the bottom statusline is hidden and flikers as the cursor moves

Env

OS: Linux 6.6.8-arch1-1
Term: alacritty 0.13.0 (78fa4d6f) + tmux 3.3a
Ueberzug: 18.2.1

Screenshot

[Andrei Neculaesei]

This is super interesting, must be a bug in Neovim, definitely unexpected editor behavior.
Will try to track it down.

[Shihua Zeng]

Yeah, this bug looks kind of subtle to address. I wonder whether it is related to #43. If you have any problem reproducing this issue, please let me know.