[gtk+] Progress bar: Handle 'no more pulse'

[Matthias Clasen <matthiasc src gnome org>]

commit 10cd226dfe5fcfd277f9b1986b649bb0617b6b36
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 11 07:24:35 2013 -0500

    Progress bar: Handle 'no more pulse'
    
    Before smooth animation, stopping the pulse would abruptly stop
    the bouncy bar. This change makes it so that we slow down for
    a bit, and then stop.

 gtk/gtkprogressbar.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkprogressbar.c b/gtk/gtkprogressbar.c
index 00080bb..5e3a47d 100644
--- a/gtk/gtkprogressbar.c
+++ b/gtk/gtkprogressbar.c
@@ -588,11 +588,17 @@ tick_cb (GtkWidget     *widget,
   g_assert (priv->pulse2 > priv->pulse1);
   g_assert (frame2 > priv->frame1);
 
+  if (frame2 - priv->pulse2 > 3 * (priv->pulse2 - priv->pulse1))
+    {
+      priv->pulse1 = 0;
+      return G_SOURCE_CONTINUE;
+    }
+
   /* Determine the fraction to move the block from one frame
    * to the next when pulse_fraction is how far the block should
    * move between two calls to gtk_progress_bar_pulse().
    */
-  fraction = priv->pulse_fraction * (frame2 - priv->frame1) / (priv->pulse2 - priv->pulse1);
+  fraction = priv->pulse_fraction * (frame2 - priv->frame1) / MAX (frame2 - priv->pulse2, priv->pulse2 - 
priv->pulse1);
 
   priv->frame1 = frame2;