Variable: project-files-relative-names
project-files-relative-names is a variable defined in project.el.gz.
Value
nil
Documentation
If non-nil, project-files is allowed to return relative file names.
The file names should be relative to the project root. And this can
only happen when all returned files are in the same directory.
In other words, the DIRS argument of project-files has to be nil or a
list of only one element.
This variable is only meant to be set by Lisp code, not customized by the user.
Probably introduced at or before Emacs version 30.1.
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/project.el.gz
(defvar project-files-relative-names nil
"If non-nil, `project-files' is allowed to return relative file names.
The file names should be relative to the project root. And this can
only happen when all returned files are in the same directory.
In other words, the DIRS argument of `project-files' has to be nil or a
list of only one element.
This variable is only meant to be set by Lisp code, not customized by
the user.")