[FEATURE] Close floating window when cursor leaves buffer

[Leandros]

Is your feature request related to a problem? Please describe.
Often I'd like to take a peek at an implementation, and close the opened floating window from goto-preview when I don't have it focused anymore. It would be great if unfocusing it could close it automatically.

Describe the solution you'd like
An option in the config to close floating buffers when leaving focus.

Describe alternatives you've considered
I've tried implementing it myself using the post_open_hook, but I didn't manage to get a working solution.

post_open_hook = function(bufid, win)
  print('post_open_hook | bufid: ' .. vim.inspect(bufid) .. ' | win: ' .. vim.inspect(win))
  vim.api.nvim_create_autocmd({'WinLeave'}, {
    buffer = bufid,
    callback = function(ev)
      vim.api.nvim_win_close(win, false)
    end,
  })
end,

Thank you!

[Leandros]

The above version works the first time, but the second time the following errors occur:

[vladimir-popov]

@Leandros try to return true from your callback. It should delete autocmd.

And also, I think it's useful to mark the buffer as nomodifiable in the preview window. Together with closing the preview window on WinLeave event, it works well for me:

post_open_hook = function(buf, win)
            local orig_state = vim.api.nvim_buf_get_option(buf, 'modifiable')
            vim.api.nvim_buf_set_option(buf, 'modifiable', false)
            vim.api.nvim_create_autocmd({ 'WinLeave' }, {
                buffer = buf,
                callback = function()
                    vim.api.nvim_win_close(win, false)
                    vim.api.nvim_buf_set_option(buf, 'modifiable', orig_state)
                    return true
                end,
            })
        end

[rmagatti]

@vladimir-popov's solution is the way to go. The current ergonomics of goto-preview are exactly how I want them to be for my use-case. Hooks are provided so everyone else can implement their own flavour of behaviours. An idea would be to add community hooks to the repo that are maintained by the community that can be more easily set than copying over hook implementations all over. I'll give this some more thought