fix: 🐛 Add textScaler support to tooltip

- Made sure all UI affecting flutter inbuilt inherited widgets are wrapped over

Author: aditya-css

CHANGELOG.md

@@ -40,7 +40,9 @@
 - Deprecate [#531](https://github.com/SimformSolutionsPvtLtd/flutter_showcaseview/pull/531) - 
   Update deprecated `ShowCaseWidget` removal version. 
 - Improvement [#505](https://github.com/SimformSolutionsPvtLtd/flutter_showcaseview/pull/505) -
-  Fixed example app to run in flutter version `v3.32.5` .
+  Fixed example app to run in flutter version `v3.32.5`.
+- Fixed [#564](https://github.com/SimformSolutionsPvtLtd/flutter_showcaseview/issues/564) - 
+  Apply textScaler to tooltip widgets.
 
 ## [4.0.1]
 - Fixed [#493](https://github.com/SimformSolutionsPvtLtd/flutter_showcaseview/issues/493) - ShowCase.withWidget not showing issue 

lib/src/models/flutter_inherited_data.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+/// Container for captured inherited widget data from showcase's context.
+class FlutterInheritedData {
+  const FlutterInheritedData({
+    required this.mediaQuery,
+    required this.textDirection,
+    required this.capturedThemes,
+    required this.textStyle,
+  });
+
+  factory FlutterInheritedData.fromContext(BuildContext context) {
+    return FlutterInheritedData(
+      mediaQuery: MediaQuery.of(context),
+      capturedThemes: InheritedTheme.capture(
+        from: context,
+        to: Navigator.maybeOf(context)?.context,
+      ),
+      textDirection: Directionality.of(context),
+      textStyle: DefaultTextStyle.of(context).style,
+    );
+  }
+
+  final MediaQueryData mediaQuery;
+  final CapturedThemes capturedThemes;
+  final TextDirection textDirection;
+  final TextStyle textStyle;
+}

lib/src/showcase/showcase_controller.dart

@@ -24,6 +24,7 @@ import 'dart:math';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
+import '../models/flutter_inherited_data.dart';
 import '../models/linked_showcase_data_model.dart';
 import '../models/tooltip_action_config.dart';
 import '../tooltip/tooltip.dart';
@@ -98,6 +99,10 @@ class ShowcaseController {
   /// Global floating action widget to be displayed
   FloatingActionWidget? globalFloatingActionWidget;
 
+  /// Captured inherited widget data from showcase context
+  late final FlutterInheritedData inheritedData =
+      FlutterInheritedData.fromContext(_context);
+
   /// Returns the Showcase widget configuration.
   ///
   /// Provides access to all properties and settings of the current showcase

lib/src/utils/overlay_manager.dart

@@ -177,7 +177,7 @@ class OverlayManager {
       child: const Align(),
     );
 
-    return Stack(
+    final overlayChild = Stack(
       // This key is used to force rebuild the overlay when needed.
       // this key enables `_overlayEntry?.markNeedsBuild();` to detect that
       // output of the builder has changed.
@@ -202,6 +202,26 @@ class OverlayManager {
         ...controllers.expand((object) => object.tooltipWidgets),
       ],
     );
+
+    final inheritedData = firstController.inheritedData;
+
+    // Wrap the child with captured themes to maintain the original context's
+    // theme. Captured themes are used as to cover cases where there are
+    // multiple themes in the widget tree.
+    final themedChild = inheritedData.capturedThemes.wrap(overlayChild);
+
+    // Wrap with other inherited widgets to maintain showcase's context's
+    // inherited values.
+    return Directionality(
+      textDirection: inheritedData.textDirection,
+      child: MediaQuery(
+        data: inheritedData.mediaQuery,
+        child: DefaultTextStyle(
+          style: inheritedData.textStyle,
+          child: themedChild,
+        ),
+      ),
+    );
   }
 
   /// Extracts and returns linked showcase data from controllers.