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.

(cherry picked from commit 6702a448c1c2500abb4f393da29edc31acd5e058)

diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index ae97c1093d3daf626f89d8cd6a671b426dbb8dee..4f5cbd45492a989a583fb0c950291c4c49ddace8 100644 (file)
--- 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,