[Material] Fix Tooltip to respect ambient Directionality (#41629)

* Fix Tooltip Directionality

* Add regression test comment for tooltip directionality fix

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

@@ -286,20 +286,23 @@ class _TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
     // We create this widget outside of the overlay entry's builder to prevent
     // updated values from happening to leak into the overlay when the overlay
     // rebuilds.
-    final Widget overlay = _TooltipOverlay(
-      message: widget.message,
-      height: height,
-      padding: padding,
-      margin: margin,
-      decoration: decoration,
-      textStyle: textStyle,
-      animation: CurvedAnimation(
-        parent: _controller,
-        curve: Curves.fastOutSlowIn,
+    final Widget overlay = Directionality(
+      textDirection: Directionality.of(context),
+      child: _TooltipOverlay(
+        message: widget.message,
+        height: height,
+        padding: padding,
+        margin: margin,
+        decoration: decoration,
+        textStyle: textStyle,
+        animation: CurvedAnimation(
+          parent: _controller,
+          curve: Curves.fastOutSlowIn,
+        ),
+        target: target,
+        verticalOffset: verticalOffset,
+        preferBelow: preferBelow,
       ),
-      target: target,
-      verticalOffset: verticalOffset,
-      preferBelow: preferBelow,
     );
     _entry = OverlayEntry(builder: (BuildContext context) => overlay);
     Overlay.of(context, debugRequiredFor: widget).insert(_entry);

packages/flutter/test/material/tooltip_test.dart

@@ -576,6 +576,39 @@ void main() {
     expect(textStyle.decoration, TextDecoration.underline);
   });
 
+  testWidgets('Tooltip overlay respects ambient Directionality', (WidgetTester tester) async {
+    // Regression test for https://github.com/flutter/flutter/issues/40702.
+    Widget buildApp(String text, TextDirection textDirection) {
+      return MaterialApp(
+        home: Directionality(
+          textDirection: textDirection,
+          child: Center(
+            child: Tooltip(
+              message: text,
+              child: Container(
+                width: 100.0,
+                height: 100.0,
+                color: Colors.green[500],
+              ),
+            ),
+          ),
+        ),
+      );
+    }
+
+    await tester.pumpWidget(buildApp(tooltipText, TextDirection.rtl));
+    await tester.longPress(find.byType(Tooltip));
+    expect(find.text(tooltipText), findsOneWidget);
+    RenderParagraph tooltipRenderParagraph = tester.renderObject<RenderParagraph>(find.text(tooltipText));
+    expect(tooltipRenderParagraph.textDirection, TextDirection.rtl);
+
+    await tester.pumpWidget(buildApp(tooltipText, TextDirection.ltr));
+    await tester.longPress(find.byType(Tooltip));
+    expect(find.text(tooltipText), findsOneWidget);
+    tooltipRenderParagraph = tester.renderObject<RenderParagraph>(find.text(tooltipText));
+    expect(tooltipRenderParagraph.textDirection, TextDirection.ltr);
+  });
+
   testWidgets('Tooltip overlay wrapped with a non-fallback DefaultTextStyle widget', (WidgetTester tester) async {
     // A Material widget is needed as an ancestor of the Text widget.
     // It is invalid to have text in a Material application that