From ce1b99cb56984f8588be8d6468d05d46c6476f76 Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Tue, 9 Oct 2012 22:56:37 -0600
Subject: [PATCH] Remove alt-z tiles when all tiles load at target z

The changes in a14a15159fb93e6ad75df3abd9ad6748c67d50e1 made it so tiles
at alternate resolutions were not pruned when target tiles finished loading.
---
 src/ol/renderer/dom/tilelayer.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/ol/renderer/dom/tilelayer.js b/src/ol/renderer/dom/tilelayer.js
index d03d3eee2d..24de2b5eac 100644
--- a/src/ol/renderer/dom/tilelayer.js
+++ b/src/ol/renderer/dom/tilelayer.js
@@ -111,6 +111,22 @@ ol.renderer.dom.TileLayer.prototype.handleTileChange_ = function(event) {
     var key = tileCoord.toString();
     delete this.loadingTiles_[key];
   }
+  var loaded = true;
+  for (var key in this.loadingTiles_) {
+    loaded = false;
+    break;
+  }
+  if (loaded) {
+    var z = this.renderedZ_;
+    for (var key in this.renderedTiles_) {
+      tileCoord = ol.TileCoord.createFromString(key);
+      if (tileCoord.z !== z) {
+        tile = this.renderedTiles_[key];
+        delete this.renderedTiles_[key];
+        goog.dom.removeNode(tile.getImage(this));
+      }
+    }
+  }
 };