[gtk/font-rendering-demo-3] Turn off metrics hinting

[Matthias Clasen <matthiasc src gnome org>]

commit d9bc8232c69c68f7b89d4051b329627b2c0dc2c2
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jul 28 13:31:24 2018 -0400

    Turn off metrics hinting
    
    This will be necessary to see the effects of subpixel
    positioning.

 gtk/gtksettings.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index 08e16f074a..047f893f11 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -3033,7 +3033,7 @@ settings_update_font_options (GtkSettings *settings)
 
   options = cairo_font_options_create ();
 
-  cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_ON);
+  cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_OFF);
 
   hint_style = CAIRO_HINT_STYLE_DEFAULT;
   if (hinting == 0)