Modified the computeMinIntrinsicHeight method to calculate the height properly (#75513)

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

@@ -1268,13 +1268,12 @@ class _RenderDecoration extends RenderBox {
     final double containerHeight = contentPadding.top
       + (label == null ? 0.0 : decoration.floatingLabelHeight)
       + _lineHeight(width, <RenderBox?>[prefix, input, suffix])
-      + subtextHeight
       + contentPadding.bottom
       + densityOffset.dy;
     final double minContainerHeight = decoration.isDense! || expands
       ? 0.0
       : kMinInteractiveDimension;
-    return math.max(containerHeight, minContainerHeight);
+    return math.max(containerHeight, minContainerHeight) + subtextHeight;
   }
 
   @override

packages/flutter/test/material/input_decorator_test.dart

@@ -4548,4 +4548,29 @@ void main() {
     expect(errorDetails?.toString(), contains("InputDecorator's children reported a negative baseline"));
     expect(errorDetails?.toString(), contains('RenderStack'));
   });
+
+  testWidgets('min intrinsic height for TextField with no content padding', (WidgetTester tester) async {
+    // Regression test for: https://github.com/flutter/flutter/issues/75509
+    await tester.pumpWidget(MaterialApp(
+      home: Material(
+        child: Center(
+          child: IntrinsicHeight(
+            child: Column(
+              children: const <Widget>[
+                TextField(
+                  decoration: InputDecoration(
+                    labelText: 'Label Text',
+                    helperText: 'Helper Text',
+                    contentPadding: EdgeInsets.zero,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    ));
+
+    expect(tester.takeException(), isNull);
+  });
 }