[gtk/initial-style: 3/3] border: Don't render initial borders

[Matthias Clasen <matthiasc src gnome org>]

commit 5faf977f668e342ac00a5a8a26f8b7d137353e25
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 1 09:12:12 2020 +0100

    border: Don't render initial borders
    
    Add a fast exist for comon case that the border
    values are unset.

 gtk/gtkrenderborder.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtkrenderborder.c b/gtk/gtkrenderborder.c
index 220494178d..b574002203 100644
--- a/gtk/gtkrenderborder.c
+++ b/gtk/gtkrenderborder.c
@@ -657,6 +657,9 @@ gtk_css_style_snapshot_border (GtkCssBoxes *boxes,
 
   border = boxes->style->border;
 
+  if (border->base.type == GTK_CSS_BORDER_INITIAL_VALUES)
+    return;
+
   if (gtk_border_image_init (&border_image, boxes->style))
     {
       cairo_t *cr;