Center on scroll

[jeffcap1]

Is there an option to center the screen when using Snacks.scroll? Normally I had a the below keymap to do this for <c-D> and <c-U>, but it doesn't seem to play well with Snacks.scroll. When starting anywhere that isn't the center of the screen, the second jump causes a weird jump that is pretty jarring.

vim.keymap.set("n", "<C-d>", "<C-d>zz", desc = "Scroll down")
vim.keymap.set("n", "<C-u>", "<C-u>zz", desc = "Scroll up")

I tried adding a scrolloff of 999 to my Snacks.scroll config to force centering, but that didn't seem to have an effect. My normal scrolloff setting is at 8.

{
  scroll = { enabled = true, scrolloff = 999 },
}

[folke]

It's not possible for snacks to detect that kind of scrolling unfortunately.
As far as snacks is concerned, that zz never happened.

You can configure vim.o.scrolloff = 999 though, or do somthing like the below to just set it for scrolling keymaps:

vim.keymap.set("n", "<C-d>", function()
  vim.wo.scrolloff = 999
  vim.defer_fn(function()
    vim.wo.scrolloff = 8
  end, 500)
  return "<c-d>"
end, { expr = true })

vim.keymap.set("n", "<C-u>", function()
  vim.wo.scrolloff = 999
  vim.defer_fn(function()
    vim.wo.scrolloff = 8
  end, 500)
  return "<c-u>"
end, { expr = true })

[jeffcap1]

Thanks for the explanation, Folke. The revised keymap function you provided is working perfectly with Snacks.scroll, thank you so much!