Re:Ask HN: Why did major desktop OSes settle on a macOS-like...
by Chanticleer on Saturday June 10, 2023 @06:56PM
(#36276125)
The RISC OS, specifically the "Arthur" version released in 1987, was the first to have something like the Dock. Look at the screenshot on the Wikipedia page.
https://en.wikipedia.org/wiki/History_of_RISC_OS