Steps to Reproduce:

1. Create a space with a space character in its name, like "A B"
2. Create another document, e.g., named, "Test"
3. Open the "Move / Rename" option in the document menu
4. Use the tree selector to select "A B" as new parent

Expected result:

The document "A B" is selected and used as parent.

Actual result:

The selected parent is "A%20B", and this is also what's used as new parent: