bug: Several bugs related to re-loading buffer with `:e`

[tomtomjhj]

Neovim version (nvim -v)

0.10.4 and nightly

Operating system/version

ubuntu 22.04

Output of :AerialInfo

Aerial Info
-----------
Filetype: markdown
Configured backends:
  treesitter (supported) (attached)
  lsp (not supported) [No LSP client found that supports symbols]
  markdown (supported)
  asciidoc (not supported) [Filetype is not asciidoc]
  man (not supported) [Filetype is not man]
Show symbols: Class, Constructor, Enum, Function, Interface, Module, Method, Struct

Describe the bug

• Bug 1: on_detach is not called when buffer is reloaded with :e.
• Bug 2: Symbols are not refreshed when buffer is reloaded with :e.
• Bug 3: Positions are not refreshed when buffer is reloaded with :e.

What is the severity of this bug?

minor (annoyance)

Steps To Reproduce

In all the following examples, use the following config file repro.lua and run nvim with nvim -u repro.lua README.md in the aerial repo.

vim.cmd[[set runtimepath+=.]]
local aerial = require'aerial'
aerial.setup {
  on_attach = function(bufnr)
    vim.keymap.set('n', '[[', aerial.prev, { buffer = bufnr })
    vim.keymap.set('n', ']]', aerial.next, { buffer = bufnr })
  end
}

Bug 1

1. nvim -u repro.lua README.md
2. Reload the buffer with :e
3. Check that [[ and ]] mappings are overwritten by builtin markdown ftplugin. It does move to headings, but it does not highlight them.

Bug 2

1. nvim -u repro.lua README.md
2. :e
3. :lua require'aerial'.next(). Note that it doesn't move the cursor, because aerials BufUnload autocmd clears the bufdata.

Bug 3

1. nvim -u repro.lua README.md
2. ]] twice. The cursor is now on the second heading.
3. :au FileType * lua require('aerial').refetch_symbols()
4. :e
5. :lua require'aerial'.next(). This moves the cursor to the first heading, instead of the third heading.

Expected Behavior

see above

Minimal example file

No response

Minimal init.lua

Additional context

No response