printer: fix panic in replacements in look-around corner case

The abstraction boundary fuck up is the gift that keeps on giving. It
turns out that the invariant that the match would never exceed the range
given is not always true. So we kludge around it.

Also, update the CHANGELOG to include the fix for #2111.

Fixes #3180

tests/regression.rs

@@ -1654,3 +1654,16 @@ rgtest!(r3173_hidden_whitelist_only_dot, |dir: Dir, _: TestCommand| {
     eqnice!(cmd().args(&["--files", "."]).stdout(), "./.foo.txt\n");
     eqnice!(cmd().args(&["--files", "./"]).stdout(), "./.foo.txt\n");
 });
+
+// See: https://github.com/BurntSushi/ripgrep/issues/3180
+rgtest!(r3180_look_around_panic, |dir: Dir, mut cmd: TestCommand| {
+    dir.create("haystack", " b b b b b b b b\nc\n");
+
+    let got = cmd
+        .arg(r#"(^|[^a-z])((([a-z]+)?)\s)?b(\s([a-z]+)?)($|[^a-z])"#)
+        .arg("haystack")
+        .arg("-U")
+        .arg("-rx")
+        .stdout();
+    eqnice!("xbxbx\n", got);
+});