bug#57635: 29.0.50; Look into using generator.el's CPS machinery to replace 'eshell-do-eval'

[Stefan Monnier]

> In order to make long-running Eshell commands behave more-nicely, Eshell
> uses iterative evaluation of many commands so that it can return control
> back to the rest of Emacs. This has a lot of similarity to how
> generator.el works.

Indeed, the idea would be to replace the commands that launch processes
with "yields" to an external loop (that just launches the next process
and then calls the generator again).


        Stefan