[smuxi/stable] Frontend-GNOME: fix illegal memory access from non-main thread in MenuWidget.OnOpenLogActionActivate

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

commit 0e893a8f8e3ad9e91de9e21db51f59be5f87fedb
Author: Mirco Bauer <meebey meebey net>
Date:   Thu Aug 24 16:52:41 2017 -0700

    Frontend-GNOME: fix illegal memory access from non-main thread in MenuWidget.OnOpenLogActionActivated()
    
    Accessing ChatViewManager.CurrentChatView has to happen in the main thread as it
    is reading GTK+ owned memory.
    
        smuxi-frontend-gnome:25051): WARNING **: Gtk operations should be done on the main Thread
          at System.Environment.get_StackTrace () [0x00000] in <dca3b561b8ad4f9fb10141d81b39ff45>:0
          at Gtk.Application.AssertMainThread () [0x00000] in <f6dd2edfa65247bd83faaf0a2f883585>:0
          at Gtk.TreeStore.GetValue (Gtk.TreeIter iter, System.Int32 column, GLib.Value& value) [0x00000] in 
<f6dd2edfa65247bd83faaf0a2f883585>:0
          at Gtk.TreeStore.GetValue (Gtk.TreeIter iter, System.Int32 column) [0x00000] in 
<f6dd2edfa65247bd83faaf0a2f883585>:0
          at Smuxi.Frontend.Gnome.ChatTreeView.get_CurrentChatView () [0x00023] in 
/srv/local/home/meebey/Projects/smuxi/src/Frontend-GNOME/Views/ChatTreeView.cs:39
          at Smuxi.Frontend.Gnome.ChatViewManager.get_CurrentChatView () [0x00007] in 
/srv/local/home/meebey/Projects/smuxi/src/Frontend-GNOME/ChatViewManager.cs:60
          at Smuxi.Frontend.Gnome.MenuWidget.<OnOpenLogActionActivated>m__0 (System.Object ) [0x00008] in 
/srv/local/home/meebey/Projects/smuxi/src/Frontend-GNOME/Views/MenuWidget.cs:457
          at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context (System.Object state) [0x00000] 
in <dca3b561b8ad4f9fb10141d81b39ff45>:0
          at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext 
executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean 
preserveSyncCtx) [0x00000] in <dca3b561b8ad4f9fb10141d81b39ff45>:0
          at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, 
System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in 
<dca3b561b8ad4f9fb10141d81b39ff45>:0
          at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem 
() [0x00000] in <dca3b561b8ad4f9fb10141d81b39ff45>:0
          at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00000] in 
<dca3b561b8ad4f9fb10141d81b39ff45>:0
          at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in 
<dca3b561b8ad4f9fb10141d81b39ff45>:0

 src/Frontend-GNOME/Views/MenuWidget.cs |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/src/Frontend-GNOME/Views/MenuWidget.cs b/src/Frontend-GNOME/Views/MenuWidget.cs
index 29e17e4..19a2cbd 100644
--- a/src/Frontend-GNOME/Views/MenuWidget.cs
+++ b/src/Frontend-GNOME/Views/MenuWidget.cs
@@ -345,11 +345,10 @@ namespace Smuxi.Frontend.Gnome
             Trace.Call(sender, e);
 
             try {
+                var logFile = ChatViewManager.CurrentChatView.ChatModel.LogFile;
                 ThreadPool.QueueUserWorkItem(delegate {
                     try {
-                        SysDiag.Process.Start(
-                            ChatViewManager.CurrentChatView.ChatModel.LogFile
-                        );
+                        SysDiag.Process.Start(logFile);
                     } catch (Exception ex) {
                         Frontend.ShowError(Parent, ex);
                     }