revert: don't run ftplugin/rust.lua more than once per buffer

CHANGELOG.md

@@ -6,13 +6,20 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [4.9.0] - 2024-02-23
 
 ### Added
 
 - Nix: `codelldb` adapter package (without the vscode extension)
   as a nixpkgs overlay and a flake output.
 
+### Reverted
+
+- Don't run `ftplugin/rust.lua` more than once on the same
+  buffer.
+  This prevented the client from reattaching when running
+  `:e` on a buffer [[#250](https://github.com/mrcjkb/rustaceanvim/issues/250)].
+
 ## [4.8.0] - 2024-02-20
 
 ### Added

ftplugin/rust.lua

@@ -1,8 +1,3 @@
-local bufnr = vim.api.nvim_get_current_buf()
-if vim.b[bufnr].did_rustaceanvim_ftplugin then
-  return
-end
-
 ---@type RustaceanConfig
 local config = require('rustaceanvim.config.internal')
 local types = require('rustaceanvim.types.internal')
@@ -57,5 +52,3 @@ if not auto_attach then
 end
 
 lsp.start()
-
-vim.b[bufnr].did_rustaceanvim_ftplugin = true