[gitg] Disable selection of line numbers in diff view

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

commit 0e36dfb9b417ade896b94523321b770645bd23f2
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Sun Aug 9 18:55:12 2015 +0200

    Disable selection of line numbers in diff view

 libgitg/resources/ui/diff-view/diff-view.css |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/libgitg/resources/ui/diff-view/diff-view.css b/libgitg/resources/ui/diff-view/diff-view.css
index 7b21c93..7a2d72b 100644
--- a/libgitg/resources/ui/diff-view/diff-view.css
+++ b/libgitg/resources/ui/diff-view/diff-view.css
@@ -233,6 +233,10 @@ div#diff div.file table td {
   vertical-align: top;
 }
 
+div#diff div.file table td.gutter {
+  -webkit-user-select: none;
+}
+
 div#diff div.file table td.gutter.type {
   border-right: 3px solid #d3d7cf;
   padding: 0px 3px 0px 3px;