Gimp: Creating rounded corners

Problem

How do I create rounded corners using Gimp?

Journal

20070812

Cool Solutions: Gimp Tips Part 2: Rounding Corners

Two methods for creating rounded corners:

1. Via { Script-Fu | Selection | Round... }
2. Via { Select | Shrink... } followed by { Select | Grow... }

The first method isn't available in my menu of Gimp-2.2.17 on Windows, so I'm heading for method two.