bug: opening file in the wrong split when using floating window with preview in multiple-split layout

[MomePP]

Did you check the docs and existing issues?

• I have read the docs
• I have searched the existing issues

Neovim version (nvim -v)

NVIM v0.10.3 Build type: Release LuaJIT 2.1.1736781742

Operating system/version

MacOS 15.2

Describe the bug

Using Oil in floating window with preview seems to open a file in the wrong split (not the previously focused split before entering Oil floating window).

for example, we have 2 splits : left-split and right-split.

|-------|-------|
|       |       |
|       |   x   |
|       |       |
|-------|-------|

Starting in the right split, then entering Oil floating window(:Oil --float) with a preview window. When opening a file, it should open in the right-split. But, in this case, it opens in the left-split.

What is the severity of this bug?

minor (annoyance)

Steps To Reproduce

1. nvim -u repro.lua
2. <C-w><C-v>, <C-w><C-w> vertical split window and focus on second split
3. :Oil --float open oil in floating window
4. <C-p> open oil preview window
5. select repro.lua as file to open

Expected Behavior

repro.lua should be opened in previous focus split(right split).

|-------|-------|
|       |       |
|       |   x   |
|       |       |
|-------|-------|

Directory structure

repro.lua

Repro

-- save as repro.lua
-- run with nvim -u repro.lua
-- DO NOT change the paths
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "runtime", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
  vim.fn.system({
    "git",
    "clone",
    "--filter=blob:none",
    "--single-branch",
    "https://github.com/folke/lazy.nvim.git",
    lazypath,
  })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  "folke/tokyonight.nvim",
  {
        "stevearc/oil.nvim",
        config = function()
            require("oil").setup({
              -- add any needed settings here
            })
        end,
  },
  -- add any other plugins here
}
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

vim.cmd.colorscheme("tokyonight")
-- add anything else here

Did you check the bug with a clean config?

• I have confirmed that the bug reproduces with nvim -u repro.lua using the repro.lua file above.

[tmwatchanan]

I found the same behavior as @MomePP described. With the preview enabled, the file is opened in the left window instead of the right window.

[BozeBro]

I understand the behavior now, and #560 does seem like the appropriate fix for this issue. Looks good

[tmwatchanan]

Nice, let's merge the fix then. Thank you both.