Right click on a Shortcut icon that has a label with it.
Start making a change to the label, and as you type, the text starts changing already on the Shortcut bar (this is a bit odd; I wouldn't expect the change to take until I've finished making it and pressed Enter -- I don't want to see all my typos show up while I'm typing; this slows down typing anyway).
Then press Escape.
Expect it to cancel the change, but it doesn't.
I think editing the label text should require Enter in order for the change to take, and the label text should not be updated as you type. Escape should cancel the change. Nowhere else in the UI does Escape behave this way. I would understand if Escape were the only way to dismiss the menu, then you'd have to make it keep the change. But since Enter is available also, please make it work as most people would expect it to: Enter makes the change occur; Escape cancels it.