[gtk+] scrolledwindow: Only start fade animation on "visible" scrollbars

[Carlos Garnacho <carlosg src gnome org>]

commit 0c903156ef5b043149ad4368b9b7606d985ed4bb
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Feb 24 14:52:40 2015 +0100

    scrolledwindow: Only start fade animation on "visible" scrollbars
    
    If a scrollbar is not shown (because of policies, or because it isn't
    necessary), it doesn't make sense to start fade animations on its window
    on captured motion events.

 gtk/gtkscrolledwindow.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index b3f3770..dbc0f15 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1087,8 +1087,10 @@ captured_event_cb (GtkWidget *widget,
 
   if (event->type == GDK_MOTION_NOTIFY)
     {
-      indicator_start_fade (&priv->hindicator, 1.0);
-      indicator_start_fade (&priv->vindicator, 1.0);
+      if (priv->hscrollbar_visible)
+        indicator_start_fade (&priv->hindicator, 1.0);
+      if (priv->vscrollbar_visible)
+        indicator_start_fade (&priv->vindicator, 1.0);
 
       if ((event->motion.state &
            (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)) != 0)