pgtk: Make x-display-grayscale-p return Qt

We already unconditionally claim that `xw-display-color-p`, which,
according to the docstring of this function, implies that we handle
grayscale too.

* src/pgtkfns.c (Fx_display_grayscale_p): Return Qt unconditionally.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index ae97c1093d3..4f5cbd45492 100644
--- a/src/pgtkfns.c
+++ b/src/pgtkfns.c
@@ -2291,7 +2291,7 @@ DEFUN ("x-display-grayscale-p", Fx_display_grayscale_p, Sx_display_grayscale_p,
        doc: /* SKIP: real doc in xfns.c.  */)
   (Lisp_Object terminal)
 {
-  return Qnil;
+  return Qt;
 }
 
 DEFUN ("x-display-pixel-width", Fx_display_pixel_width, Sx_display_pixel_width, 0, 1, 0,