master c70a3a4: Revert feature added in bfd96e995d using project directories in vc (bug#41821)

[Juri Linkov]

branch: master
commit c70a3a41630a39283f10f183cefb4643a6d424cc
Author: Juri Linkov <juri@linkov.net>
Commit: Juri Linkov <juri@linkov.net>

    Revert feature added in bfd96e995d using project directories in vc 
(bug#41821)
---
 etc/NEWS            | 4 ----
 lisp/vc/vc-dir.el   | 2 +-
 lisp/vc/vc-hooks.el | 5 -----
 lisp/vc/vc.el       | 6 ++----
 4 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 930c00c..fc5c215 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -197,10 +197,6 @@ The relevant commands are those that don't change the VC 
state.
 The non-file buffers which can use VC commands are those that have
 their 'default-directory' under VC.
 
-*** 'M-n' now works in minibuffer prompts of VC commands.
-Typing 'M-n' in the minibuffer that prompts for a VC directory in VC
-commands now retrieves directories of previously used VC projects.
-
 *** New command 'vc-dir-root' uses the root directory without asking.
 
 *** New commands 'vc-dir-mark-registered-files' (bound to '* r') and
diff --git a/lisp/vc/vc-dir.el b/lisp/vc/vc-dir.el
index 46be9b7..cdf8ab9 100644
--- a/lisp/vc/vc-dir.el
+++ b/lisp/vc/vc-dir.el
@@ -1366,7 +1366,7 @@ These are the commands available for use in the file 
status buffer:
     ;; Otherwise if you do C-x v d -> C-x C-f -> C-x v d
     ;; you may get a new *vc-dir* buffer, different from the original
     (file-truename (read-directory-name "VC status for directory: "
-                                       (vc-root-dir) (vc-known-roots) t
+                                       (vc-root-dir) nil t
                                        nil))
     (if current-prefix-arg
        (intern
diff --git a/lisp/vc/vc-hooks.el b/lisp/vc/vc-hooks.el
index 46f5535..ce72a49 100644
--- a/lisp/vc/vc-hooks.el
+++ b/lisp/vc/vc-hooks.el
@@ -299,11 +299,6 @@ non-nil if FILE exists and its contents were successfully 
inserted."
     (set-buffer-modified-p nil)
     t))
 
-(declare-function project-try-vc "project")
-(defun vc-known-roots ()
-  "Return a list of known vc roots."
-  (seq-filter #'project-try-vc (project-known-project-roots)))
-
 (defun vc-find-root (file witness)
   "Find the root of a checked out project.
 The function walks up the directory tree from FILE looking for WITNESS.
diff --git a/lisp/vc/vc.el b/lisp/vc/vc.el
index 49323ef..65775f8 100644
--- a/lisp/vc/vc.el
+++ b/lisp/vc/vc.el
@@ -2001,8 +2001,7 @@ saving the buffer."
          rootdir working-revision)
       (if backend
          (setq rootdir (vc-call-backend backend 'root default-directory))
-       (setq rootdir (read-directory-name "Directory for VC root-diff: "
-                                           nil (vc-known-roots)))
+       (setq rootdir (read-directory-name "Directory for VC root-diff: "))
        (setq backend (vc-responsible-backend rootdir))
        (if backend
            (setq default-directory rootdir)
@@ -2546,8 +2545,7 @@ with its diffs (if the underlying VCS supports that)."
         rootdir)
     (if backend
        (setq rootdir (vc-call-backend backend 'root default-directory))
-      (setq rootdir (read-directory-name "Directory for VC revision log: "
-                                         nil (vc-known-roots)))
+      (setq rootdir (read-directory-name "Directory for VC revision log: "))
       (setq backend (vc-responsible-backend rootdir))
       (unless backend
         (error "Directory is not version controlled")))