Merge pull request #12204 from archseer/lsp-user-data

lsp/completion: Expose completion_item under completed_items.user_data + vim-patch:8.2.0084

runtime/doc/insert.txt

@@ -1083,7 +1083,8 @@ items:
 	empty		when non-zero this match will be added even when it is
 			an empty string
 	user_data 	custom data which is associated with the item and
-			available in |v:completed_item|
+			available in |v:completed_item|; it can be any type;
+			defaults to an empty string
 
 All of these except "icase", "equal", "dup" and "empty" must be a string.  If
 an item does not meet these requirements then an error message is given and

runtime/lua/vim/lsp/util.lua

@@ -240,6 +240,13 @@ function M.text_document_completion_list_to_complete_items(result, prefix)
       icase = 1,
       dup = 1,
       empty = 1,
+      user_data = {
+        nvim = {
+          lsp = {
+            completion_item = completion_item
+          }
+        }
+      },
     })
   end