Merge pull request #391 from MakotoE/master

Fix panic in `find_words` due to string access outside of a character boundary

src/lib.rs

@@ -1851,6 +1851,12 @@ mod tests {
         );
     }
 
+    #[test]
+    fn fill_unicode_boundary() {
+        // https://github.com/mgeisler/textwrap/issues/390
+        fill("\u{1b}!Ͽ", 10);
+    }
+
     #[test]
     #[cfg(not(feature = "smawk"))]
     #[cfg(not(feature = "unicode-linebreak"))]

src/word_separators.rs

@@ -216,7 +216,7 @@ impl WordSeparator for UnicodeBreakProperties {
         let mut opportunities = unicode_linebreak::linebreaks(&stripped)
             .filter(|(idx, _)| {
                 #[allow(clippy::match_like_matches_macro)]
-                match &line[..*idx].chars().next_back() {
+                match &stripped[..*idx].chars().next_back() {
                     // We suppress breaks at ‘-’ since we want to control
                     // this via the WordSplitter.
                     Some('-') => false,