Added will pop scope to defaultDialog

@@ -314,6 +314,9 @@ extension ExtensionDialog on GetInterface {
     double radius = 20.0,
     //   ThemeData themeData,
     List<Widget> actions,
+
+    // onWillPop Scope
+    WillPopCallback onWillPop,
   }) {
     var leanCancel = onCancel != null || textCancel != null;
     var leanConfirm = onConfirm != null || textConfirm != null;
@@ -362,8 +365,7 @@ extension ExtensionDialog on GetInterface {
       }
     }
 
-    return dialog<T>(
-      AlertDialog(
+    Widget baseAlertDialog = AlertDialog(
       titlePadding: EdgeInsets.all(8),
       contentPadding: EdgeInsets.all(8),
       backgroundColor: backgroundColor ?? theme.dialogBackgroundColor,
@@ -392,10 +394,23 @@ extension ExtensionDialog on GetInterface {
       ),
       // actions: actions, // ?? <Widget>[cancelButton, confirmButton],
       buttonPadding: EdgeInsets.zero,
+    );
+
+    if (onWillPop != null) {
+      return dialog<T>(
+        WillPopScope(
+          onWillPop: onWillPop,
+          child: baseAlertDialog,
         ),
         barrierDismissible: barrierDismissible,
       );
     }
+
+    return dialog<T>(
+      baseAlertDialog,
+      barrierDismissible: barrierDismissible,
+    );
+  }
 }
 
 extension ExtensionBottomSheet on GetInterface {