Ignore completions from gopls that we can't yet handle

We only support additionalEdits if they are provided when resolving the
completion, not if they are provided immediately.

crates/project/src/project.rs

@@ -3054,6 +3054,16 @@ impl Project {
                     Ok(completions
                         .into_iter()
                         .filter_map(|lsp_completion| {
+                            // For now, we can only handle additional edits if they are returned
+                            // when resolving the completion, not if they are present initially.
+                            if lsp_completion
+                                .additional_text_edits
+                                .as_ref()
+                                .map_or(false, |edits| !edits.is_empty())
+                            {
+                                return None;
+                            }
+
                             let (old_range, new_text) = match lsp_completion.text_edit.as_ref() {
                                 // If the language server provides a range to overwrite, then
                                 // check that the range is valid.