[extensions-web] review: Move == optimization into diffutils

[Jasper St. Pierre <jstpierre src gnome org>]

commit ffe8979409209d065d91b34eefb0b81b4163ffb2
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Jun 26 14:16:13 2012 -0400

    review: Move == optimization into diffutils

 sweettooth/review/diffutils.py |   14 +++++++++-----
 sweettooth/review/views.py     |    3 ---
 2 files changed, 9 insertions(+), 8 deletions(-)
---
diff --git a/sweettooth/review/diffutils.py b/sweettooth/review/diffutils.py
index 831d4f1..90cb7cf 100644
--- a/sweettooth/review/diffutils.py
+++ b/sweettooth/review/diffutils.py
@@ -728,11 +728,15 @@ def get_chunks(a, b):
 
         return result
 
-    if a is None or b is None:
-        if a is not None:
-            yield get_fake_chunk(len(a), tag='delete')
-        if b is not None:
-            yield get_fake_chunk(len(b), tag='insert')
+    if a == b:
+        return
+
+    if a is None:
+        yield get_fake_chunk(len(b), tag='insert')
+        return
+
+    if b is None:
+        yield get_fake_chunk(len(a), tag='delete')
         return
 
     a_num_lines = len(a)
diff --git a/sweettooth/review/views.py b/sweettooth/review/views.py
index 878a49c..ebae1b1 100644
--- a/sweettooth/review/views.py
+++ b/sweettooth/review/views.py
@@ -176,9 +176,6 @@ def ajax_get_file_diff_view(request, version):
     old_zipfile, new_zipfile = get_zipfiles(get_old_version(version), version)
     oldlines, newlines = grab_lines(old_zipfile, filename), grab_lines(new_zipfile, filename)
 
-    if oldlines == newlines:
-        return None
-
     chunks = list(get_chunks(oldlines, newlines))
     return dict(chunks=chunks,
                 oldlines=oldlines,