[progval]

This looks like it's targeted at webapp developers who want to use windows within their app. It does make sense for apps with a lot of modals, like an in-browser Gimp clone for example.

[smt88]

I think that's assuming the Gimp UX is good, and I would disagree with that.

IDEs (and a lot of web apps) work like tiling WMs, which is a far better UX.

There's a good reason Gimp is one of very few apps with that frustrating, disjointed everything-is-a-window design.