From cd5ae452737495328a0cd99d0fc72dd53c5754a6 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Sun, 19 May 2013 10:16:12 +0200
Subject: [PATCH] Do not manage cache when cached tile is on target layer's
 backbuffer

---
 lib/OpenLayers/TileManager.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/OpenLayers/TileManager.js b/lib/OpenLayers/TileManager.js
index 4a0663710d..a492b718f3 100644
--- a/lib/OpenLayers/TileManager.js
+++ b/lib/OpenLayers/TileManager.js
@@ -388,6 +388,11 @@ OpenLayers.TileManager = OpenLayers.Class({
         if (img && (!img.parentNode ||
                  OpenLayers.Element.hasClass(img.parentNode, 'olBackBuffer'))) {
             if (tile.layer.backBuffer) {
+                if (tile.layer.backBuffer === img.parentNode) {
+                    // cached image is on the target layer's backbuffer already,
+                    // so nothing to do here
+                    return;
+                }
                 img.style.opacity = 0;
                 img.style.visibility = 'hidden';
             }