From c9d1725f5c8ae02ac595db735fa96aa142594a78 Mon Sep 17 00:00:00 2001
From: Olivier Guyot <olivier.guyot@camptocamp.com>
Date: Mon, 13 May 2019 16:16:26 +0200
Subject: [PATCH] Composite renderer / trigger a render even when the source is
 undefined

---
 src/ol/renderer/Composite.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ol/renderer/Composite.js b/src/ol/renderer/Composite.js
index 2d0908c1fa..9b4ce2a1e7 100644
--- a/src/ol/renderer/Composite.js
+++ b/src/ol/renderer/Composite.js
@@ -85,7 +85,8 @@ class CompositeMapRenderer extends MapRenderer {
     this.children_.length = 0;
     for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {
       const layerState = layerStatesArray[i];
-      if (!visibleAtResolution(layerState, viewResolution) || layerState.sourceState != SourceState.READY) {
+      if (!visibleAtResolution(layerState, viewResolution) ||
+        (layerState.sourceState != SourceState.READY && layerState.sourceState != SourceState.UNDEFINED)) {
         continue;
       }