Clamp Scaffold's max body height when extendBody is true (#37254)

packages/flutter/lib/src/material/scaffold.dart

diff --git a/packages/flutter/lib/src/material/scaffold.dart b/packages/flutter/lib/src/material/scaffold.dart
index ba54421..e081c7c 100644
--- a/packages/flutter/lib/src/material/scaffold.dart
+++ b/packages/flutter/lib/src/material/scaffold.dart
@@ -432,6 +432,7 @@
 
       if (extendBody) {
         bodyMaxHeight += bottomWidgetsHeight;
+        bodyMaxHeight = bodyMaxHeight.clamp(0.0, looseConstraints.maxHeight - contentTop).toDouble();
         assert(bodyMaxHeight <= math.max(0.0, looseConstraints.maxHeight - contentTop));
       }