Element highlight does not disappear in Canvas after deleting the element in Hierarchy when the mouse position is on the selected element.

Steps to repro:
1. Create a new Project.
2. Window > UI Toolkit > UI Builder.
3. Library > Double click on Button.
4. Hierarchy > Select Button > Keep Cursor position on Button element.
5. Delete the Button element using the keyboard.

Actual Result:
Element highlight does not disappear in the Canvas.

Expected Result:
Element highlight should disappear in the Canvas.

Reproducible in:
2021.1.0a10, 2020.2.0f1, 2020.1.1f1, 2019.4.0f1 with Package version 1.0.0-preview.9.

Environment:
Occurring on Windows 10 & Mac 10.15.