Fix flutter version bug

Author: Robert-Stackflow

lib/Widgets/Item/item_builder.dart

@@ -2275,9 +2275,7 @@ class ItemBuilder {
         } else {
           return MyDesktopTextSelectionToolbar(
             anchor: details.contextMenuAnchors.primaryAnchor,
-            decoration:BoxDecoration(
-              color: Theme.of(contextMenuContext).canvasColor,
-            ),
+            backgroundColor: Theme.of(context).canvasColor,
             dividerColor: Theme.of(context).dividerColor,
             items: items,
           );
@@ -2346,9 +2344,7 @@ class ItemBuilder {
     } else {
       return MyDesktopTextSelectionToolbar(
         anchor: details.contextMenuAnchors.primaryAnchor,
-        decoration:BoxDecoration(
-          color: Theme.of(contextMenuContext).canvasColor,
-        ),
+        backgroundColor: Theme.of(contextMenuContext).canvasColor,
         dividerColor: Theme.of(contextMenuContext).dividerColor,
         items: items,
       );

lib/Widgets/Selectable/my_adaptive_text_selection_toolbar.dart

@@ -43,9 +43,9 @@ import 'my_selectable_region.dart';
 ///   widget but only for Cupertino context menus.
 /// * [TextSelectionToolbar], the default toolbar for Android.
 /// * [DesktopTextSelectionToolbar], the default toolbar for desktop platforms
-///    other than MacOChewieS.
-/// * [CupertinoTextSelectionToolbar], the default toolbar for iOChewieS.
-/// * [CupertinoDesktopTextSelectionToolbar], the default toolbar for MacOChewieS.
+///    other than MacOS.
+/// * [CupertinoTextSelectionToolbar], the default toolbar for iOS.
+/// * [CupertinoDesktopTextSelectionToolbar], the default toolbar for MacOS.
 class MyAdaptiveTextSelectionToolbar extends StatelessWidget {
   /// Create an instance of [MyAdaptiveTextSelectionToolbar] with the
   /// given [children].