Fix panic in select_textobject_around (helix-editor#9832)

Test Document
-------------
```
a)b
```

Steps to Reproduce
------------------
1. %   # select_all
1. ms( # surround_add
1. mam # select_textobject_around

Debug and Release
-----------------
`thread 'main' panicked at 'Attempt to index past end of RopeSlice:
char index 7, RopeSlice char length 6', ropey-1.6.1/src/slice.rs:796:13`

Description
-----------
An index was selected beyond the end of the slice with chars_at. The fix
adds a guard check to `find_nth_open_pair`, like in the other find_nth*
functions.

helix-core/src/surround.rs

@@ -167,6 +167,10 @@ fn find_nth_open_pair(
  mut pos: usize,
  n: usize,
 ) -> Option<usize> {
+ if pos >= text.len_chars() {
+ return None;
+ }
+
  let mut chars = text.chars_at(pos + 1);
 
  // Adjusts pos for the first iteration, and handles the case of the
@@ -383,6 +387,21 @@ mod test {
  )
  }
 
+ #[test]
+ fn test_find_nth_closest_pairs_pos_index_range_panic() {
+ #[rustfmt::skip]
+ let (doc, selection, _) =
+ rope_with_selections_and_expectations(
+ "(a)c)",
+ "^^^^^"
+ );
+
+ assert_eq!(
+ find_nth_closest_pairs_pos(doc.slice(..), selection.primary(), 1),
+ Err(Error::PairNotFound)
+ )
+ }
+
  // Create a Rope and a matching Selection using a specification language.
  // ^ is a single-point selection.
  // _ is an expected index. These are returned as a Vec<usize> for use in assertions.