bug#47287: 28.0.50; [PATCH] Add command project-remove-known-project

[Dmitry Gutov]

On 21.03.2021 08:33, Theodor Thornhill via Bug reports for GNU Emacs, 
the Swiss army knife of text editors wrote:
> However, there is one more use case: at work we have lot of repos, some I touch 
> every day, some once in a blue moon. I do not want them cluttering the 
> project-list, so I would rather delete them, and have them  automatically 
> appear for periods where I actually use them. Same with other FOSS projects I 
> only ocasionally contribute to. These are directories I usually dont delete 
> from my drive.

Sure, makes sense.