Cursor overlay jumps between context view context and child

[raineorshine]

This seems to only occur when there are context breadcrumbs.

Steps to Reproduce

- one
  - two
    - three
      - a
        - m
          - x
      - b
        - m
          - y

1. Set the cursor on one/two/three/a/m.
2. Activate Context View
3. Move the cursor between one/two/three/a/m~/a and one/two/three/a/m~/a/x.

Current Behavior

The starting position of the cursor overlay is off, causing it to jump off a before animating to b.

Expected Behavior

The cursor overlay should animate smoothly from start to finish.