Make sure that an Autocomplete doesn't crash in 0x0 environment (flutter#172732)

This is my attempt to handle
flutter#6537 for the Autocomplete UI
control.

Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

Author: ahmedsameha1

packages/flutter/test/material/autocomplete_test.dart

@@ -731,6 +731,25 @@ void main() {
     expect(field2.controller!.text, textSelection);
   });
 
+  testWidgets('Autocomplete renders at zero area', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Center(
+          child: SizedBox.shrink(
+            child: Scaffold(
+              body: Autocomplete<String>(
+                initialValue: const TextEditingValue(text: 'X'),
+                optionsBuilder: (TextEditingValue textEditingValue) => <String>['Y'],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+    final Finder xText = find.text('X');
+    expect(tester.getSize(xText), Size.zero);
+  });
+
   testWidgets('autocomplete options have button semantics', (WidgetTester tester) async {
     const Color highlightColor = Color(0xFF112233);
     await tester.pumpWidget(