Fix projectile-recentf with inactive project (#1881)

projectile-recentf-files expands recentf files to use canonicalized
versions, /home/example/project instead of ~/project. However, if the
project is not active and projectile-recentf was called, it would return
non-canonicalized directory which then fails the comparison with recentf
list.

CHANGELOG.md

@@ -11,6 +11,10 @@
 * [#1877](https://github.com/bbatsov/projectile/pull/1877): Add custom variable `projectile-cmd-hist-ignoredups`.
 * Add support for Eask projects.
 
+### Bugs fixed
+
+* [#1881](https://github.com/bbatsov/projectile/issues/1881): Fix projectile-recentf when called outside any project
+
 ## 2.8.0 (2023-10-13)
 
 ### New features

projectile.el

@@ -4933,7 +4933,7 @@ directory to open."
 (defun projectile-recentf-files ()
   "Return a list of recently visited files in a project."
   (and (boundp 'recentf-list)
-       (let ((project-root (projectile-acquire-root)))
+       (let ((project-root (expand-file-name (projectile-acquire-root))))
          (mapcar
           (lambda (f) (file-relative-name f project-root))
           (cl-remove-if-not