chore: extend fix to != and ++ ligatures, match existing test style

src/shape.rs

@@ -829,11 +829,16 @@ impl ShapeSpan {
             // The unicode-linebreak crate treats the pipe character '|' as a break opportunity (BA/AL class).
             // This causes ShapeSpan::build to split text like '|>' into separate ShapeWords.
             // When these words are shaped independently, the font shaping engine cannot form ligatures that cross the word boundary.
-            // We manually check for the '|>' sequence during segmentation and skip the break opportunity to ensure they remain in the same shaping run.
+            // We manually check for known ligature sequences during segmentation and skip the break opportunity
+            // to ensure they remain in the same shaping run.
             if end_lb > 0 && end_lb < span.len() {
                 let b = span.as_bytes();
-                if b[end_lb - 1] == b'|' && b[end_lb] == b'>' {
-                    continue;
+                match (b[end_lb - 1], b[end_lb]) {
+                    (b'|', b'>') | // |>
+                    (b'!', b'=') | // !=
+                    (b'+', b'+')   // ++
+                    => continue,
+                    _ => {}
                 }
             }
 

tests/shaping_and_rendering.rs

@@ -102,4 +102,28 @@ fn test_ligature_segmentation() {
         "Expected '|>' to be a single word (preserved for ligature), but found {} words.",
         span.words.len()
     );
+
+    // Test !=
+    buffer.set_text("!=", &Attrs::new(), Shaping::Advanced, None);
+    buffer.shape_until_scroll(false);
+    let line = &buffer.lines[0];
+    let shape = line.shape_opt().expect("ShapeLine not found");
+    assert_eq!(
+        shape.spans[0].words.len(),
+        1,
+        "Expected '!=' to be a single word, but found {} words.",
+        shape.spans[0].words.len()
+    );
+
+    // Test ++
+    buffer.set_text("++", &Attrs::new(), Shaping::Advanced, None);
+    buffer.shape_until_scroll(false);
+    let line = &buffer.lines[0];
+    let shape = line.shape_opt().expect("ShapeLine not found");
+    assert_eq!(
+        shape.spans[0].words.len(),
+        1,
+        "Expected '++' to be a single word, but found {} words.",
+        shape.spans[0].words.len()
+    );
 }