Revert "TextField constrained layout bug (#65966)" (#66027)

This reverts commit 10a66b19.

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

@@ -1032,12 +1032,11 @@ class _RenderDecoration extends RenderBox {
       counterHeight,
       helperErrorHeight,
     );
-    final Offset densityOffset = decoration.visualDensity.baseSizeAdjustment;
     boxToBaseline[input] = _layoutLineBox(
       input,
       boxConstraints.deflate(EdgeInsets.only(
-        top: contentPadding.top + topHeight + densityOffset.dy / 2,
-        bottom: contentPadding.bottom + bottomHeight + densityOffset.dy / 2,
+        top: contentPadding.top + topHeight,
+        bottom: contentPadding.bottom + bottomHeight,
       )).copyWith(
         minWidth: inputWidth,
         maxWidth: inputWidth,
@@ -1066,12 +1065,13 @@ class _RenderDecoration extends RenderBox {
       prefixHeight - boxToBaseline[prefix],
       suffixHeight - boxToBaseline[suffix],
     );
-    final double fixBelowInput = fixBelowBaseline <= 0.0 ? 0.0 : math.max(
+    final double fixBelowInput = math.max(
       0,
       fixBelowBaseline - (inputHeight - inputInternalBaseline),
     );
 
     // Calculate the height of the input text container.
+    final Offset densityOffset = decoration.visualDensity.baseSizeAdjustment;
     final double prefixIconHeight = prefixIcon == null ? 0 : prefixIcon.size.height;
     final double suffixIconHeight = suffixIcon == null ? 0 : suffixIcon.size.height;
     final double fixIconHeight = math.max(prefixIconHeight, suffixIconHeight);
@@ -1087,8 +1087,8 @@ class _RenderDecoration extends RenderBox {
     );
     final double minContainerHeight = decoration.isDense || decoration.isCollapsed || expands
       ? 0.0
-      : kMinInteractiveDimension;
-    final double maxContainerHeight = boxConstraints.maxHeight - bottomHeight;
+      : kMinInteractiveDimension + densityOffset.dy;
+    final double maxContainerHeight = boxConstraints.maxHeight - bottomHeight + densityOffset.dy;
     final double containerHeight = expands
       ? maxContainerHeight
       : math.min(math.max(contentHeight, minContainerHeight), maxContainerHeight);

packages/flutter/test/material/input_decorator_test.dart

@@ -4235,55 +4235,4 @@ void main() {
     expect(tester.getSize(find.text(labelText)).width, labelWidth);
     expect(getOpacity(tester, prefixText), 1.0);
   });
-
-  testWidgets('given enough space, constrained and unconstrained heights result in the same size widget', (WidgetTester tester) async {
-    // Regression test for https://github.com/flutter/flutter/issues/65572
-    final UniqueKey keyUnconstrained = UniqueKey();
-    final UniqueKey keyConstrained = UniqueKey();
-
-    Widget getInputDecorator(VisualDensity visualDensity) {
-      return MaterialApp(
-        home: Material(
-          child: Builder(
-            builder: (BuildContext context) {
-              return Theme(
-                data: Theme.of(context).copyWith(visualDensity: visualDensity),
-                child: Center(
-                  child: Row(
-                    children: <Widget>[
-                      SizedBox(
-                        width: 35.0,
-                        child: TextField(
-                          key: keyUnconstrained,
-                        ),
-                      ),
-                      SizedBox(
-                        width: 35.0,
-                        // 48 is the height that this TextField would take when
-                        // laid out with no constraints.
-                        height: 48.0,
-                        child: TextField(
-                          key: keyConstrained,
-                        ),
-                      ),
-                    ],
-                  ),
-                ),
-              );
-            },
-          ),
-        ),
-      );
-    }
-
-    await tester.pumpWidget(getInputDecorator(VisualDensity.standard));
-    final double constrainedHeight = tester.getSize(find.byKey(keyConstrained)).height;
-    final double unConstrainedHeight = tester.getSize(find.byKey(keyUnconstrained)).height;
-    expect(constrainedHeight, equals(unConstrainedHeight));
-
-    await tester.pumpWidget(getInputDecorator(VisualDensity.compact));
-    final double constrainedHeightCompact = tester.getSize(find.byKey(keyConstrained)).height;
-    final double unConstrainedHeightCompact = tester.getSize(find.byKey(keyUnconstrained)).height;
-    expect(constrainedHeightCompact, equals(unConstrainedHeightCompact));
-  });
 }