create savepoint before requesting completion

helix-term/src/commands.rs

@@ -4181,6 +4181,7 @@ pub fn completion(cx: &mut Context) {
     iter.reverse();
     let offset = iter.take_while(|ch| chars::char_is_word(*ch)).count();
     let start_offset = cursor.saturating_sub(offset);
+    doc.savepoint();
 
     cx.callback(
         future,

helix-term/src/ui/editor.rs

@@ -957,9 +957,6 @@ impl EditorView {
             return;
         }
 
-        // Immediately initialize a savepoint
-        doc_mut!(editor).savepoint();
-
         editor.last_completion = None;
         self.last_insert.1.push(InsertEvent::TriggerCompletion);