feat(diagnostic)!: make DiagnosticChanged a first class autocmd (#16098)

This allows users to hook into diagnostic events with finer granularity
(e.g. per-buffer or file).

BREAKING CHANGE: DiagnosticsChanged and LspDiagnosticsChanged user
autocommands are removed.

1 files changed, 7 insertions, 3 deletions

diff --git a/runtime/lua/vim/diagnostic.lua b/runtime/lua/vim/diagnostic.lua
index cdf349dbdd..015db54d34 100644
--- a/runtime/lua/vim/diagnostic.lua
+++ b/runtime/lua/vim/diagnostic.lua
@@ -671,12 +671,14 @@ function M.set(namespace, bufnr, diagnostics, opts)
     M.show(namespace, bufnr, diagnostics, opts)
   end
 
-  vim.api.nvim_command("doautocmd <nomodeline> User DiagnosticsChanged")
+  vim.api.nvim_command(
+    string.format("doautocmd <nomodeline> DiagnosticChanged %s", vim.api.nvim_buf_get_name(bufnr))
+  )
 end
 
 --- Get namespace metadata.
 ---
----@param ns number Diagnostic namespace
+---@param namespace number Diagnostic namespace
 ---@return table Namespace metadata
 function M.get_namespace(namespace)
   vim.validate { namespace = { namespace, 'n' } }
@@ -1331,7 +1333,9 @@ function M.reset(namespace, bufnr)
     end
   end
 
-  vim.api.nvim_command("doautocmd <nomodeline> User DiagnosticsChanged")
+  vim.api.nvim_command(
+      string.format("doautocmd <nomodeline> DiagnosticChanged %s", vim.api.nvim_buf_get_name(bufnr))
+  )
 end
 
 --- Add all diagnostics to the quickfix list.