Migrate the material Tooltip to use windowing

Author: mattkae

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

@@ -472,6 +472,41 @@ class Tooltip extends StatefulWidget {
   }
 }
 
+class _TooltipStateController {
+  _TooltipStateController({required this.useWindowing}) {
+    if (this.useWindowing) {
+    } else {
+      overlayPortalController = OverlayPortalController();
+    }
+  }
+
+  final bool useWindowing;
+  late final OverlayPortalController? overlayPortalController;
+  late final TooltipWindowController? tooltipWindowController;
+
+  bool get isShowing {
+    if (useWindowing) {
+      return false;
+    } else {
+      return overlayPortalController!.isShowing;
+    }
+  }
+
+  void show() {
+    if (useWindowing) {
+    } else {
+      overlayPortalController!.show();
+    }
+  }
+
+  void hide() {
+    if (useWindowing) {
+    } else {
+      overlayPortalController!.hide();
+    }
+  }
+}
+
 /// Contains the state for a [Tooltip].
 ///
 /// This class can be used to programmatically show the Tooltip, see the
@@ -490,7 +525,7 @@ class TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
   static const bool _defaultEnableFeedback = true;
   static const TextAlign _defaultTextAlign = TextAlign.start;
 
-  final OverlayPortalController _overlayController = OverlayPortalController();
+  final _TooltipStateController _overlayController = _TooltipStateController(useWindowing: false);
 
   // From InheritedWidgets
   late bool _visible;
@@ -948,7 +983,7 @@ class TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
       );
     }
     return OverlayPortal(
-      controller: _overlayController,
+      controller: _overlayController.overlayPortalController!,
       overlayChildBuilder: _buildTooltipOverlay,
       child: result,
     );