master ad3ec429a12: Fix treesit-install-language-grammar (bug#63990)

[Yuan Fu]

branch: master
commit ad3ec429a12fb8caa460de5911145d1d3c46d626
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Fix treesit-install-language-grammar (bug#63990)
    
    * lisp/treesit.el:
    (treesit-install-language-grammar): When called non-interactively,
    out-dir should default to default-out-dir.
---
 lisp/treesit.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/treesit.el b/lisp/treesit.el
index ea701ce1ff7..d79e7732387 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -3070,7 +3070,9 @@ nil, the grammar is installed to the standard location, 
the
                    nil
                    'treesit--install-language-grammar-out-dir-history
                    default-out-dir)
-                out-dir)))
+                ;; When called non-interactively, OUT-DIR should
+                ;; default to DEFAULT-OUT-DIR.
+                (or out-dir default-out-dir))))
     (condition-case err
         (progn
           (apply #'treesit--install-language-grammar-1