pairs: Use token utf8 lengths instead of 1.

helix-core/src/auto_pairs.rs

@@ -69,7 +69,7 @@ fn handle_open(
         let pos = range.head;
         let next = next_char(doc, pos);
 
-        ranges.push(Range::new(range.anchor, pos + 1)); // pos + open
+        ranges.push(Range::new(range.anchor, pos + open.len_utf8())); // pos + open
 
         match next {
             Some(ch) if !close_before.contains(ch) => {
@@ -98,7 +98,7 @@ fn handle_close(doc: &Rope, selection: &Selection, _open: char, close: char) ->
         let pos = range.head;
         let next = next_char(doc, pos);
 
-        ranges.push(Range::new(range.anchor, pos + 1)); // pos + close
+        ranges.push(Range::new(range.anchor, pos + close.len_utf8())); // pos + close
 
         if next == Some(close) {
             //  return transaction that moves past close