[CP] Constrain _RenderScaledInlineWidget child size in computeDryLayout #131765 (#132096)

CP request: flutter/flutter#132095

Author: LongCatIsLooong

packages/flutter/lib/src/widgets/widget_span.dart

@@ -362,7 +362,7 @@ class _RenderScaledInlineWidget extends RenderBox with RenderObjectWithChildMixi
   Size computeDryLayout(BoxConstraints constraints) {
     assert(!constraints.hasBoundedHeight);
     final Size unscaledSize = child?.computeDryLayout(BoxConstraints(maxWidth: constraints.maxWidth / scale)) ?? Size.zero;
-    return unscaledSize * scale;
+    return constraints.constrain(unscaledSize * scale);
   }
 
   @override

packages/flutter/test/widgets/text_test.dart

@@ -273,8 +273,8 @@ void main() {
         textDirection: TextDirection.ltr,
         child: Center(
           child: SizedBox(
-            width: 100.3,
-            child: Text.rich(WidgetSpan(child: Row()), textScaleFactor: 0.3),
+            width: 502.5454545454545,
+            child: Text.rich(WidgetSpan(child: Row()), textScaleFactor: 0.95),
           ),
         ),
       ),