[6.x] Prevent dropping nav item with children into root position #13861
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This pull request fixes an issue where it was possible to drag & drop a nav item with children into the root position. Root nav items can't have children.
We were previously passing a hook via the
rootDroppableprop to handle this. Although, it wasn't working (the hook is called when you drag items, not when you drop them) and was removed in #12582.This PR attempts to fix it by checking the new root entry in the
afterDropevent listener.Closes #13826