From fe24f02005c60698212a5d7f8fc6ef8d99f158d7 Mon Sep 17 00:00:00 2001
From: Strahinja Val Markovic <val@markovic.io>
Date: Wed, 29 Oct 2014 10:02:41 -0700
Subject: [PATCH] Minor refactoring

---
 python/ycm/diagnostic_interface.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/python/ycm/diagnostic_interface.py b/python/ycm/diagnostic_interface.py
index 29092647..79b9dcb3 100644
--- a/python/ycm/diagnostic_interface.py
+++ b/python/ycm/diagnostic_interface.py
@@ -165,14 +165,14 @@ def _GetKeptAndNewSigns( placed_signs, buffer_number_to_line_to_diags,
 
 
 def _PlaceNewSigns( kept_signs, new_signs ):
-  placed_signs = kept_signs
+  placed_signs = kept_signs[:]
   for sign in new_signs:
     # Do not set two signs on the same line, it will screw up storing sign
     # locations.
     if sign in placed_signs:
       continue
     vimsupport.PlaceSign( sign.id, sign.line, sign.buffer, sign.is_error )
-    placed_signs += [ sign ]
+    placed_signs.append(sign)
   return placed_signs