Breakage by commit "779bc886f9 * Improve detection of Git submodules"

[Tassilo Horn]

Hi Dmitry,

since the commit in the subject, I get errors like the below when
finding a file in a git repository:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (file-missing "Opening input file" "No such file 
or directory" "/home/horn/Repos/el/emacs/lisp/net/.git")
  insert-file-contents(".git")
  project-try-vc("/home/horn/Repos/el/emacs/lisp/net/")
  run-hook-with-args-until-success(project-try-vc 
"/home/horn/Repos/el/emacs/lisp/net/")
  project--find-in-directory("/home/horn/Repos/el/emacs/lisp/net/")
  project-current()
  eglot--maybe-activate-editing-mode()
  run-hooks(change-major-mode-after-body-hook after-change-major-mode-hook)
  normal-mode(t)
  after-find-file(nil nil t nil nil)
  revert-buffer--default(t nil)
  revert-buffer(t)
  funcall-interactively(revert-buffer t)
  call-interactively(revert-buffer record nil)
  command-execute(revert-buffer record)
--8<---------------cut here---------------end--------------->8---

Bye,
Tassilo