[gitg] Only update diff when options really change

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 0dc64527137b33ac06dfa5e9634e46d907101d05
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Thu Jul 10 14:03:24 2014 +0200

    Only update diff when options really change

 libgitg/gitg-diff-view.vala |   24 ++++++++++++++++--------
 1 files changed, 16 insertions(+), 8 deletions(-)
---
diff --git a/libgitg/gitg-diff-view.vala b/libgitg/gitg-diff-view.vala
index 44fe3d3..9502104 100644
--- a/libgitg/gitg-diff-view.vala
+++ b/libgitg/gitg-diff-view.vala
@@ -111,16 +111,22 @@ namespace Gitg
 
                private void flag_set(Ggit.DiffOption f, bool val)
                {
+                       var flags = options.flags;
+
                        if (val)
                        {
-                               options.flags |= f;
+                               flags |= f;
                        }
                        else
                        {
-                               options.flags &= ~f;
+                               flags &= ~f;
                        }
 
-                       update();
+                       if (flags != options.flags)
+                       {
+                               options.flags = flags;
+                               update();
+                       }
                }
 
                public bool ignore_whitespace
@@ -140,9 +146,8 @@ namespace Gitg
                                if (d_changes_inline != value)
                                {
                                        d_changes_inline = value;
+                                       update();
                                }
-
-                               update();
                        }
 
                        default = false;
@@ -154,10 +159,13 @@ namespace Gitg
 
                        set
                        {
-                               options.n_context_lines = value;
-                               options.n_interhunk_lines = value;
+                               if (options.n_context_lines != value)
+                               {
+                                       options.n_context_lines = value;
+                                       options.n_interhunk_lines = value;
 
-                               update();
+                                       update();
+                               }
                        }
 
                        default = 3;