Search does not handle collapse

When you collapse the parent of a hit from the search (marked with red border), the marked hit of the search is moved to another node which does not match the search.

**Example:**
1. Open the Demo https://fritz-c.github.io/react-sortable-tree/
2. Expand All
3. Search for the text: "Nested", and you get a hit on second child of "title"
4. Collapse the first node "`title`" and the hit is moved to "Chicken"