[gnome-panel/gtk3] Fix panel_background_update_has_alpha() when background is solid color

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 42eaac42594a23f3ec11d15e7a403eda99d4a98d
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Mon Jan 17 17:40:35 2011 +0100

    Fix panel_background_update_has_alpha() when background is solid color

 gnome-panel/panel-background.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gnome-panel/panel-background.c b/gnome-panel/panel-background.c
index 0c70216..75c9d34 100644
--- a/gnome-panel/panel-background.c
+++ b/gnome-panel/panel-background.c
@@ -527,8 +527,7 @@ panel_background_update_has_alpha (PanelBackground *background)
 	gboolean has_alpha = FALSE;
 
 	if (background->type == PANEL_BACK_COLOR)
-		has_alpha = (background->color.alpha != 0xffff);
-
+		has_alpha = (background->color.alpha < 1.);
 	else if (background->type == PANEL_BACK_IMAGE &&
 		 background->loaded_image)
 		has_alpha = gdk_pixbuf_get_has_alpha (background->loaded_image);