Not a question, just a life-hack :-)
Changes, that allows showing all project files in project view is discarded. Clarification that Project View is not a Project View but Build System View is added to the documentation. So, now there is no way to propagate CMakeProjectManager2 changes to the upstream at all.
But we can still display all files using stock plugin and existing functionality. Just hack it using fake
file(GLOB_RECURSE ...)scan project tree for files