Show Type Hierarchy shows no results for types declared in notebooks

[debonte]

Environment data

• Language Server version: 2024.4.105
• OS and version: Windows 11
• Python version: 3.12.1

Code Snippet

class Base:
    pass

class Derived(Base):
    pass

Repro Steps

1. Create a new notebook.
2. Paste the code above in the first cell
3. Right-click on Base and select "Show Type Hierarchy"

Expected behavior

Derived is listed as a subtype.

Actual behavior

No subtypes shown. This is because we're not decoding the URI within the TypeHierarchySubtypesParams and we attempt to use that within TypeHierarchyProvider.