fix(core): match inside closest pair inconsitency

Make tree-sitter version of matching inside/around to replicate current behavior of plaintext files.
That is:
* match around - always tries to extend a selection to the next pair,
even when the selection is already around a pair.
* match inside - do not extend a selection when it already completely
matches the pairs.

helix-core/src/surround.rs

@@ -57,9 +57,7 @@ fn find_nth_closest_pairs_ts(
     mut skip: usize,
 ) -> Result<(usize, usize)> {
     let mut opening = range.from();
-    // We want to expand the selection if we are already on the found pair,
-    // otherwise we would need to subtract "-1" from "range.to()".
-    let mut closing = range.to();
+    let mut closing = range.to() - 1;
 
     while skip > 0 {
         closing = find_matching_bracket_fuzzy(syntax, text, closing).ok_or(Error::PairNotFound)?;

helix-core/src/textobject.rs

@@ -229,7 +229,19 @@ fn textobject_pair_surround_impl(
 ) -> Range {
     let pair_pos = match ch {
         Some(ch) => surround::find_nth_pairs_pos(slice, ch, range, count),
-        None => surround::find_nth_closest_pairs_pos(syntax, slice, range, count),
+        None => {
+            surround::find_nth_closest_pairs_pos(syntax, slice, range, count).and_then(|closest| {
+                // Since `find_nth_closest_pairs_pos` takes into accout the closest
+                // pair even if the range included it entirely, we need to handle this
+                // edge case separetely. In such cases, we want to actually find the
+                // next pair.
+                if Range::new(closest.0, closest.1).len() == range.len() - 1 && count == 1 {
+                    surround::find_nth_closest_pairs_pos(syntax, slice, range, count + 1)
+                } else {
+                    Ok(closest)
+                }
+            })
+        }
     };
     pair_pos
         .map(|(anchor, head)| match textobject {

helix-term/tests/test/movement.rs

@@ -409,6 +409,36 @@ async fn match_around_closest_ts() -> anyhow::Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread")]
+async fn match_inside_closest_ts() -> anyhow::Result<()> {
+    test_with_config(
+        AppBuilder::new().with_file("foo.rs", None),
+        (
+            r#"fn main() {func(#["|]#string");}"#,
+            "mim",
+            r##"fn main() {func("#[string|]#");}"##,
+        ),
+    )
+    .await?;
+
+    Ok(())
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn match_mix_closest_ts() -> anyhow::Result<()> {
+    test_with_config(
+        AppBuilder::new().with_file("foo.rs", None),
+        (
+            r#"fn main() {func("st#[|r]#ing");}"#,
+            "mimmammimmam",
+            r#"fn main() {func#[|("string")]#;}"#,
+        ),
+    )
+    .await?;
+
+    Ok(())
+}
+
 /// Ensure the very initial cursor in an opened file is the width of
 /// the first grapheme
 #[tokio::test(flavor = "multi_thread")]