PrimitiveCollection.removeAll removes guid

CHANGES.md

@@ -26,6 +26,7 @@ Change Log
 * Fixed image size issue when using multiple particle systems. [#7412](https://github.com/AnalyticalGraphicsInc/cesium/pull/7412)
 * Fixed Sandcastle's "Open in New Window" button not displaying imagery due to blob URI limitations. [#7250](https://github.com/AnalyticalGraphicsInc/cesium/pull/7250)
 * Fixed an issue where setting `scene.globe.cartographicLimitRectangle` to `undefined` would cause a crash. [#7477](https://github.com/AnalyticalGraphicsInc/cesium/issues/7477)
+* Fixed `PrimitiveCollection.removeAll` to no longer `contain` removed primitives.
 
 ### 1.53 - 2019-01-02
 

Source/Scene/PrimitiveCollection.js

@@ -181,10 +181,11 @@ define([
      * @see PrimitiveCollection#destroyPrimitives
      */
     PrimitiveCollection.prototype.removeAll = function() {
-        if (this.destroyPrimitives) {
-            var primitives = this._primitives;
-            var length = primitives.length;
-            for ( var i = 0; i < length; ++i) {
+        var primitives = this._primitives;
+        var length = primitives.length;
+        for ( var i = 0; i < length; ++i) {
+            delete primitives[i]._external._composites[this._guid];
+            if (this.destroyPrimitives) {
                 primitives[i].destroy();
             }
         }

Specs/Scene/PrimitiveCollectionSpec.js

@@ -202,6 +202,22 @@ defineSuite([
         expect(primitives.contains(labels1)).toEqual(false);
     });
 
+    it('does not contain removed primitive', function() {
+        var labels0 = createLabels();
+        primitives.add(labels0);
+        primitives.remove(labels0);
+
+        expect(primitives.contains(labels0)).toEqual(false);
+    });
+
+    it('does not contain all removed primitives', function() {
+        var labels0 = createLabels();
+        primitives.add(labels0);
+        primitives.removeAll();
+
+        expect(primitives.contains(labels0)).toEqual(false);
+    });
+
     it('does not contain undefined', function() {
         expect(primitives.contains()).toEqual(false);
     });