[gitg] Do not recompute diff when only changing tab width

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

commit 8aba6770bb17e042e6355a6c38b29b17c97d6c36
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Thu Jul 10 19:13:16 2014 +0200

    Do not recompute diff when only changing tab width

 libgitg/gitg-diff-view.vala |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)
---
diff --git a/libgitg/gitg-diff-view.vala b/libgitg/gitg-diff-view.vala
index 19b6286..3d09725 100644
--- a/libgitg/gitg-diff-view.vala
+++ b/libgitg/gitg-diff-view.vala
@@ -121,7 +121,7 @@ namespace Gitg
                                if (d_tab_width != value)
                                {
                                        d_tab_width = value;
-                                       update();
+                                       update_tab_width();
                                }
                        }
                        default = 4;
@@ -452,6 +452,21 @@ namespace Gitg
                        update();
                }
 
+               private void update_tab_width()
+               {
+                       if (!d_loaded)
+                       {
+                               return;
+                       }
+
+                       run_javascript.begin(@"update_tab_width($d_tab_width);", null, (obj, res) => {
+                               try
+                               {
+                                       run_javascript.end(res);
+                               } catch {}
+                       });
+               }
+
                private void update()
                {
                        if (!d_loaded)