Why does in-line Label Edit in Windows Explorer have a delay?

Question

When you open Windows Explorer, then select some file or folder, then click its file name, an inline label-edit will be invoked. But there is an intentional delay before the textbox is displayed. Why?

First I thought its because I can move the mouse away until the textbox appears to cancel the edit, but it happens in any case.

Answer 1

I would guess that the delay is to distinguish clicks from double clicks.