fix: 🐛 fix incorrect previous / next pages calculation

src/components/Navigation/Navigation.js

@@ -145,15 +145,20 @@ const calculateNavigation = (edges) => {
  };
 };
 
-function flat(acc, val) {
- const parent = acc.concat(val.children);
- const child = val.children.reduce(flat, []);
- return parent.concat(child);
+const flat = (parent, acc) => {
+ parent.children.forEach(child => {
+ acc.push(child);
+ flat(child, acc);
+ })
 }
 
 const calculateFlatNavigation = (edges) => {
  const navigation = calculateNavigation(edges);
- return navigation.children.reduce(flat, []);
+ const acc = [];
+ navigation.children.forEach(group => {
+ flat(group, acc)
+ })
+ return acc;;
 };
 
 export { getNavigationData, calculateNavigation, calculateFlatNavigation };