centerscroll: use lua to filter buftypes

after/plugin/centerscroll.vim

@@ -1,5 +0,0 @@
-" from https://vi.stackexchange.com/a/26055
-augroup KeepCentered
-  autocmd!
-  autocmd CursorMoved * normal! zz
-augroup END

plugin/centerscroll.lua

@@ -0,0 +1,16 @@
+-- " from https://vi.stackexchange.com/a/26055
+-- augroup KeepCentered
+--   autocmd!
+--   autocmd CursorMoved * if &buftype == '' | normal! zz | endif
+-- augroup END
+
+vim.api.nvim_create_augroup("KeepCentered", { clear = true })
+vim.api.nvim_create_autocmd("CursorMoved", {
+  group = "KeepCentered",
+  pattern = '*',
+  callback = function() 
+    if vim.o.buftype == '' then
+      vim.cmd([[normal! zz]])
+    end
+  end,
+})