[smuxi/stable] Frontend-GNOME: fix Gtk-CRITICAL message (closes: #826)

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

commit 65d052558113094a9b7f4ea073fbf56435c46741
Author: Mirco Bauer <meebey meebey net>
Date:   Tue Feb 23 12:48:31 2016 +0100

    Frontend-GNOME: fix Gtk-CRITICAL message (closes: #826)
    
    GTK+ writes an assertion failed message when setting a value that is out of
    range like this:
    
        (smuxi-frontend-gnome:31653): Gtk-CRITICAL **: IA__gtk_progress_set_percentage: assertion `percentage 
> = 0 && percentage <= 1.0' failed

 src/Frontend-GNOME/MainWindow.cs |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/Frontend-GNOME/MainWindow.cs b/src/Frontend-GNOME/MainWindow.cs
index 3ff9531..95c1fc4 100644
--- a/src/Frontend-GNOME/MainWindow.cs
+++ b/src/Frontend-GNOME/MainWindow.cs
@@ -647,7 +647,14 @@ namespace Smuxi.Frontend.Gnome
         {
             var totalChatCount = ChatViewManager.Chats.Count;
             var syncedChatCount =  ChatViewManager.SyncedChats.Count;
-            ProgressBar.Fraction = (double)syncedChatCount / totalChatCount;
+            var fraction = (double) syncedChatCount / totalChatCount;
+            // clamp value to avoid Gtk-CRITICAL assert failed messages
+            if (fraction < 0) {
+                fraction = 0;
+            } else if (fraction > 1) {
+                fraction = 1;
+            }
+            ProgressBar.Fraction = fraction;
             ProgressBar.Text = String.Format("{0} / {1}",
                                               syncedChatCount,
                                               totalChatCount);