[snappy] ui: no timeout for timeless media

[Luis de Bethencourt <luisbg src gnome org>]

commit f3b59d271fecb4288a494982c88034f81e62e93e
Author: Luis de Bethencourt <luis debethencourt com>
Date:   Tue May 1 17:59:02 2012 +0100

    ui: no timeout for timeless media
    
    Timeout to update time position and seekbar isn't neccesary
    and even can be a problem with timeless media, like for example
    DVD menus.

 src/user_interface.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/user_interface.c b/src/user_interface.c
index 2d5bcec..ca52e3f 100644
--- a/src/user_interface.c
+++ b/src/user_interface.c
@@ -697,9 +697,10 @@ progress_timing (UserInterface * ui)
     g_source_remove (ui->progress_id);
 
   duration_ns = ui->engine->media_duration / MILISEC;
-  timeout_ms = duration_ns / ui->seek_width;
-
-  ui->progress_id = g_timeout_add (timeout_ms, progress_update_seekbar, ui);
+  if (duration_ns > 0) {
+    timeout_ms = duration_ns / ui->seek_width;
+    ui->progress_id = g_timeout_add (timeout_ms, progress_update_seekbar, ui);
+  }
 }
 
 static gboolean