USS selector names are shown as '...' when renaming is canceled with the ESC key

Steps to reproduce:

1. Create and open a new project
2. Create and open a new UXML file in UI Builder
3. Create and attach a USS to the UI Builder
4. Create a class selector
5. Activate the rename action on any selector
6. Cancel the rename and observe the selector name

Actual results: The previous name is displayed

Expected results: '...' is displayed

Reproducible with versions: 6000.6.0a6, 6000.6.0a7

Not reproducible with versions: 6000.0.77f1, 6000.3.18f1, 6000.4.12f1, 6000.5.1f1, 6000.6.0a5

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• If the name is overwritten with at least one other character (change/add/remove), the name will update to the newest, but any further cancel of rename will reproduce the issue again