Add narrow no-break space support (#9604)

1 files changed, 17 insertions, 1 deletions

diff --git a/helix-tui/src/widgets/reflow.rs b/helix-tui/src/widgets/reflow.rs
index c30aa6e0..67c4db44 100644
--- a/helix-tui/src/widgets/reflow.rs
+++ b/helix-tui/src/widgets/reflow.rs
@@ -4,6 +4,7 @@ use helix_core::unicode::width::UnicodeWidthStr;
 use unicode_segmentation::UnicodeSegmentation;
 
 const NBSP: &str = "\u{00a0}";
+const NNBSP: &str = "\u{202f}";
 
 /// A state machine to pack styled symbols into lines.
 /// Cannot implement it as Iterator since it yields slices of the internal buffer (need streaming
@@ -58,7 +59,8 @@ impl<'a, 'b> LineComposer<'a> for WordWrapper<'a, 'b> {
         let mut symbols_exhausted = true;
         for StyledGrapheme { symbol, style } in &mut self.symbols {
             symbols_exhausted = false;
-            let symbol_whitespace = symbol.chars().all(&char::is_whitespace) && symbol != NBSP;
+            let symbol_whitespace =
+                symbol.chars().all(&char::is_whitespace) && symbol != NBSP && symbol != NNBSP;
 
             // Ignore characters wider that the total max width.
             if symbol.width() as u16 > self.max_line_width
@@ -497,6 +499,20 @@ mod test {
     }
 
     #[test]
+    fn line_composer_word_wrapper_nnbsp() {
+        let width = 20;
+        let text = "AAAAAAAAAAAAAAA AAAA\u{202f}AAA";
+        let (word_wrapper, _) = run_composer(Composer::WordWrapper { trim: true }, text, width);
+        assert_eq!(word_wrapper, vec!["AAAAAAAAAAAAAAA", "AAAA\u{202f}AAA",]);
+
+        // Ensure that if the character was a regular space, it would be wrapped differently.
+        let text_space = text.replace('\u{202f}', " ");
+        let (word_wrapper_space, _) =
+            run_composer(Composer::WordWrapper { trim: true }, &text_space, width);
+        assert_eq!(word_wrapper_space, vec!["AAAAAAAAAAAAAAA AAAA", "AAA",]);
+    }
+
+    #[test]
     fn line_composer_word_wrapper_preserve_indentation() {
         let width = 20;
         let text = "AAAAAAAAAAAAAAAAAAAA    AAA";