Previous not working as expected when restricting to parent

I determined that this is an issue with how the previous links are checked. In menuPagerGetNavigation() and menuPagerFlattenTree() it's returning the full menu tree, which means checking previous will only check the previous item in the flattened tree. Which in my scenario would be "Grandchild 3".

So here's a patch! It pulls the menu restricting by the parent as the root and max depth = 1, meaning the flattened tree will only contain siblings. Works good on my local environment/scenario.

Automatically closed - issue fixed for 2 weeks with no activity.