[longomatch] Pause playback before leaving Period sync widget.

[Andoni Morales Alastruey <amorales src gnome org>]

commit b89f22341c2f5118cf2f90a2b5a87e796fb7fa8c
Author: Julien Moutte <julien fluendo com>
Date:   Fri Mar 13 19:12:37 2015 +0100

    Pause playback before leaving Period sync widget.
    
    Indeed leaving the widget while playing could produce a race and a crash in widget destruction.

 LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs b/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
index 6ab9499..4559e82 100644
--- a/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
+++ b/LongoMatch.GUI/Gui/Panel/NewProjectPanel.cs
@@ -511,6 +511,8 @@ namespace LongoMatch.Gui.Panel
                                        return;
                                }
                        } else if (notebook1.Page == PROJECT_PERIODS) {
+                               // Pause playback and then save periods changes into the project. Fileset has 
already been updated.
+                               projectperiods1.Pause ();
                                projectperiods1.SaveChanges ();
                                StartProject ();
                                return;