make explore pages keep alive and listen for settings change

lib/utils/ext.dart

@@ -24,6 +24,18 @@ extension ListExt<T> on List<T>{
       add(value);
     }
   }
+
+  bool isEqualsTo(List<T> list){
+    if(length != list.length){
+      return false;
+    }
+    for(int i=0; i<length; i++){
+      if(this[i] != list[i]){
+        return false;
+      }
+    }
+    return true;
+  }
 }
 
 extension StringExt on String{