[gnome-shell] StThemeNode: support border-image: none

[Owen Taylor <otaylor src gnome org>]

commit adbc1d97a0f64fcc309336e06d095db8fc02d113
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Sun Mar 20 20:49:40 2011 -0400

    StThemeNode: support border-image: none
    
    Treat border-image: none as a valid specification that overwrites any
    previously specified border image.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=644788

 src/st/st-theme-node.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/src/st/st-theme-node.c b/src/st/st-theme-node.c
index 2a857ab..7adfd13 100644
--- a/src/st/st-theme-node.c
+++ b/src/st/st-theme-node.c
@@ -2518,6 +2518,15 @@ st_theme_node_get_border_image (StThemeNode *node)
 
           char *filename;
 
+          /* Support border-image: none; to suppress a previously specified border image */
+          if (term_is_none (term))
+            {
+              if (term->next == NULL)
+                return NULL;
+              else
+                goto next_property;
+            }
+
           /* First term must be the URL to the image */
           if (term->type != TERM_URI)
             goto next_property;