fix(diagnostic): preserve fields from LSP diagnostics via user_data (#15735)master

* preserve fields from LSP diagnostics via adding a user_data table to the diagnostic, which can hold arbitrary data in addition to the lsp diagnostic information.

1 files changed, 12 insertions, 3 deletions

diff --git a/runtime/lua/vim/lsp/diagnostic.lua b/runtime/lua/vim/lsp/diagnostic.lua
index 148836a93a..a9d93ae65f 100644
--- a/runtime/lua/vim/lsp/diagnostic.lua
+++ b/runtime/lua/vim/lsp/diagnostic.lua
@@ -102,7 +102,16 @@ local function diagnostic_lsp_to_vim(diagnostics, bufnr, client_id)
       end_lnum = _end.line,
       end_col = line_byte_from_position(buf_lines, _end.line, _end.character, offset_encoding),
       severity = severity_lsp_to_vim(diagnostic.severity),
-      message = diagnostic.message
+      message = diagnostic.message,
+      user_data = {
+        lsp = {
+          code = diagnostic.code,
+          codeDescription = diagnostic.codeDescription,
+          tags = diagnostic.tags,
+          relatedInformation = diagnostic.relatedInformation,
+          data = diagnostic.data,
+        },
+      },
     }
   end, diagnostics)
 end
@@ -110,7 +119,7 @@ end
 ---@private
 local function diagnostic_vim_to_lsp(diagnostics)
   return vim.tbl_map(function(diagnostic)
-    return {
+    return vim.tbl_extend("error", {
       range = {
         start = {
           line = diagnostic.lnum,
@@ -123,7 +132,7 @@ local function diagnostic_vim_to_lsp(diagnostics)
       },
       severity = severity_vim_to_lsp(diagnostic.severity),
       message = diagnostic.message,
-    }
+    }, diagnostic.user_data and (diagnostic.user_data.lsp or {}) or {})
   end, diagnostics)
 end