After clearing recent project items, the project switcher window no longer lists recent projects.

Alternatively, if when the program launched perhaps it could scan the recent projects list. If it finds that any of those projects are no longer around it would automatically clear them out of the recent projects list. Other editors will auto clear the project if you try to switch to a project that no longer exists but I think the aforementioned solution is easier to manage from the user perspective.

 

Yeah, auto-clearing the list would be nice. I do happen to rename a project's path/name or even move it. When I open it again from the new path I have 2 entries of that project in the list. And one of them is dead.

 

The "workspaces" key in the sublime session file (<Data directory>/Settings/Session.sublime_session) defines a "recent_workspaces" key which then defines a list of the recent project's file paths. I did not test it, but if one can edit these keys manually and they have an effect I imagine that you can also write a plugin to do so.