[smuxi/stable] Frontend-GNOME: mark signal handling thread as background thread

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit 9fee07fcc44e18819b7a393803559bc312dd5666
Author: Mirco Bauer <meebey meebey net>
Date:   Mon Jan 25 18:44:15 2016 +0100

    Frontend-GNOME: mark signal handling thread as background thread
    
    Foreground threads can prevent the AppDomain from exiting cleanly as it waits
    for all foreground threads to terminate.

 src/Frontend-GNOME/Frontend.cs |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Frontend-GNOME/Frontend.cs b/src/Frontend-GNOME/Frontend.cs
index e0f9d53..9bd9730 100644
--- a/src/Frontend-GNOME/Frontend.cs
+++ b/src/Frontend-GNOME/Frontend.cs
@@ -1044,6 +1044,7 @@ namespace Smuxi.Frontend.Gnome
                         Quit();
                     });
                 });
+                signal_thread.IsBackground = true;
                 signal_thread.Start();
             }
         }