[gthumb] disconnect from the task after completing

[Paolo Bacchilega <paobac src gnome org>]

commit 921e3e3873a2475831b242a689d1359c3917b41a
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Jan 7 13:03:59 2015 +0100

    disconnect from the task after completing

 gthumb/gth-browser.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index 5da47eb..6c6c900 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -5313,6 +5313,7 @@ background_task_completed_cb (GthTask  *task,
        GthBrowser *browser = task_data->browser;
 
        browser->priv->background_tasks = g_list_remove (browser->priv->background_tasks, task_data);
+       g_signal_handler_disconnect (task, task_data->completed_event);
        task_data_free (task_data);
 
        if (error == NULL)