concealable frontlayer when that's active by pressing back button on …

…phone

By default, when the frontLayer widget  visibility is active, the user expects to hide it by pressing the back button. However, in the current version, this did not happen, and unfortunately, outside of this library, I was unable to hide the frontLayer widget. To achieve this, I removed the ‍concealBacklayerOnBackButton‍ argument and modified the Scaffold class in this library. Now, this operation is successfully executed.

lib/src/scaffold.dart

@@ -220,7 +220,6 @@ class BackdropScaffold extends StatefulWidget {
   /// Specifiy whether to conceal [backLayer] when back button pressed.
   ///
   /// Default to `true`.
-  final bool concealBacklayerOnBackButton;
 
   // ------------- PROPERTIES TAKEN OVER FROM SCAFFOLD ------------- //
 
@@ -336,7 +335,6 @@ class BackdropScaffold extends StatefulWidget {
     this.onBackLayerConcealed,
     this.onBackLayerRevealed,
     this.maintainBackLayerState = true,
-    this.concealBacklayerOnBackButton = true,
     this.scaffoldKey,
     this.appBar,
     this.floatingActionButton,
@@ -612,17 +610,16 @@ class BackdropScaffoldState extends State<BackdropScaffold>
       );
 
   Widget _wrapWillPopScope(BuildContext context, {required Widget child}) {
-    if (!widget.concealBacklayerOnBackButton) return child;
-    return WillPopScope(
-      onWillPop: () async {
-        if (isBackLayerRevealed) {
-          concealBackLayer();
+    if (!isBackLayerRevealed) {
+      return WillPopScope(
+        onWillPop: () async {
+          revealBackLayer();
           return false;
-        }
-        return true;
-      },
-      child: child,
-    );
+        },
+        child: child,
+      );
+    }
+    return child;
   }
 
   Widget _buildBody(BuildContext context) => _wrapWillPopScope(