Don't display empty tooltips (Tooltips with empty `message` property) (#87638)

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

@@ -475,6 +475,12 @@ class _TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
 
   @override
   Widget build(BuildContext context) {
+    // If message is empty then no need to create a tooltip overlay to show
+    // the empty black container so just return the wrapped child as is or
+    // empty container if child is not specified.
+    if (widget.message.isEmpty) {
+      return widget.child ?? const SizedBox();
+    }
     assert(Overlay.of(context, debugRequiredFor: widget) != null);
     final ThemeData theme = Theme.of(context);
     final TooltipThemeData tooltipTheme = TooltipTheme.of(context);

packages/flutter/test/material/tooltip_test.dart

@@ -1497,6 +1497,32 @@ void main() {
     await testGestureLongPress(tester, tooltip);
     expect(find.text(tooltipText), findsNothing);
   });
+
+  testWidgets('Tooltip should not be shown with empty message (with child)', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Tooltip(
+          message: tooltipText,
+          child: Text(tooltipText),
+        ),
+      ),
+    );
+    expect(find.text(tooltipText), findsOneWidget);
+  });
+
+  testWidgets('Tooltip should not be shown with empty message (without child)', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Tooltip(
+          message: tooltipText,
+        ),
+      ),
+    );
+    expect(find.text(tooltipText), findsNothing);
+    if (tooltipText.isEmpty) {
+      expect(find.byType(SizedBox), findsOneWidget);
+    }
+  });
 }
 
 Future<void> setWidgetForTooltipMode(WidgetTester tester, TooltipTriggerMode triggerMode) async {