[gnome-subtitles: 5/6] Make sure we clone the subtitle for Undo

[Pedro Castro <pcastro src gnome org>]

commit 4946211f269c83a5a1f9f82fdc049ead3defc668
Author: Pedro Castro <pedro gnomesubtitles org>
Date:   Tue May 14 08:43:26 2019 +0100

    Make sure we clone the subtitle for Undo

 src/GnomeSubtitles/Core/Command/InsertSubtitleCommand.cs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/GnomeSubtitles/Core/Command/InsertSubtitleCommand.cs 
b/src/GnomeSubtitles/Core/Command/InsertSubtitleCommand.cs
index 9a30203..64261a4 100644
--- a/src/GnomeSubtitles/Core/Command/InsertSubtitleCommand.cs
+++ b/src/GnomeSubtitles/Core/Command/InsertSubtitleCommand.cs
@@ -1,6 +1,6 @@
 /*
  * This file is part of Gnome Subtitles.
- * Copyright (C) 2006-2017 Pedro Castro
+ * Copyright (C) 2006-2019 Pedro Castro
  *
  * Gnome Subtitles is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -43,12 +43,12 @@ public abstract class InsertSubtitleCommand : SingleSelectionCommand {
 
        public override bool Execute () {
                InsertNew();
-               subtitle = Base.Document.Subtitles[newPath];
+               subtitle = Base.Document.Subtitles[newPath].Clone(Base.Document.Subtitles.Properties);
                return true;
        }
 
        public override void Undo () {
-               bool selectNext = ((Path != null) && (Path.Compare(newPath) == 1));
+               bool selectNext = (Path != null) && (Path.Compare(newPath) == 1);
                Base.Ui.View.Remove(newPath, selectNext);
        }
 
@@ -151,4 +151,4 @@ public class InsertSubtitleAtVideoPositionCommand : InsertSubtitleCommand {
        }
 }
 
-}
+}
\ No newline at end of file