autocmd only works once after upgrade to 0.10.0

[telbizov]

Problem

Hello,

I have the following setup:

vim.api.nvim_create_autocmd("CursorHold", {
    once = false,
    callback = vim.diagnostic.open_float,
})

This used to work just fine before I upgraded to 0.10.0. It used to show the diagnostic float window every time when I positioned the cursor over the line of code that had the problem. If I moved out and back in it would show it again. After upgrade it now only pops up once after starting neovim. It seems like a regression. Or perhaps I need to modify the config somehow?

Thanks

Steps to reproduce

Try the config above

Expected behavior

Show the diagnostic float window every time. I.e. trigger the callback repeatedly not, only once!

Neovim version (nvim -v)

NVIM v0.10.0

Vim (not Nvim) behaves the same?

N/A because I need LSP

Operating system/version

macOS 14.4.1

Terminal name/version

iTerm2 3.4.23

$TERM environment variable

xterm-256color

Installation

brew

[clason]

Any return value will delete the callback, see :h news.

Your example will not work correctly anyway, since the callback is called with arguments, which other functions will not expect.

Callbacks should always be wrapped in dedicated functions; do not simply pass handles to API functions.

[telbizov]

Roger that.
I had this code piece before and it used to work but I am far from an expert in neovim and Lua. Now that I took a closer look the following is what it should be:

vim.api.nvim_create_autocmd("CursorHold", {
    callback = function(ev)
        vim.diagnostic.open_float()
    end,
})

This works now!

Thanks for the pointers