expose didExceedMaxLines from RenderParagraph (#139962)

I want to build a widget that adds some extra functionality when the inner text overflow. So the problem occurred, I can't find an elegant way to determine if the text is overflowing. 
So i expose `didExceedMaxLines` from `RenderParagraph`, I think it can make sense. Have there some advice?

packages/flutter/lib/src/rendering/paragraph.dart

@@ -1034,6 +1034,16 @@ class RenderParagraph extends RenderBox with ContainerRenderObjectMixin<RenderBo
     return _textPainter.size;
   }
 
+  /// Whether the text was truncated or ellipsized as laid out.
+  ///
+  /// This returns the [TextPainter.didExceedMaxLines] of the underlying [TextPainter].
+  ///
+  /// Valid only after [layout].
+  bool get didExceedMaxLines {
+    assert(!debugNeedsLayout);
+    return _textPainter.didExceedMaxLines;
+  }
+
   /// Collected during [describeSemanticsConfiguration], used by
   /// [assembleSemanticsNode] and [_combineSemanticsInfo].
   List<InlineSpanSemanticsInformation>? _semanticsInfo;

packages/flutter/test/rendering/paragraph_test.dart

@@ -375,6 +375,41 @@ void main() {
     expect(paragraph.size.height, 30.0);
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/61018
 
+  group('didExceedMaxLines', () {
+    RenderParagraph createRenderParagraph({
+      int? maxLines,
+      TextOverflow overflow = TextOverflow.clip,
+    }) {
+      return RenderParagraph(
+        const TextSpan(
+          text: 'Here is a long text, maybe exceed maxlines',
+          style: TextStyle(fontSize: 10.0),
+        ),
+        textDirection: TextDirection.ltr,
+        overflow: overflow,
+        maxLines: maxLines,
+      );
+    }
+
+    test('none limited', () {
+      final RenderParagraph paragraph = createRenderParagraph();
+      layout(paragraph, constraints: const BoxConstraints(maxWidth: 100.0));
+      expect(paragraph.didExceedMaxLines, false);
+    });
+
+    test('limited by maxLines', () {
+      final RenderParagraph paragraph = createRenderParagraph(maxLines: 1);
+      layout(paragraph, constraints: const BoxConstraints(maxWidth: 100.0));
+      expect(paragraph.didExceedMaxLines, true);
+    });
+
+    test('limited by ellipsis', () {
+      final RenderParagraph paragraph = createRenderParagraph(overflow: TextOverflow.ellipsis);
+      layout(paragraph, constraints: const BoxConstraints(maxWidth: 100.0));
+      expect(paragraph.didExceedMaxLines, true);
+    });
+  });
+
   test('changing color does not do layout', () {
     final RenderParagraph paragraph = RenderParagraph(
       const TextSpan(