fix(cdk/drag-drop): avoid retaining disabled handles after they've been destroyed

src/cdk/drag-drop/drag-ref.ts

@@ -344,6 +344,18 @@ export class DragRef<T = any> {
     this._handles = handles.map(handle => coerceElement(handle));
     this._handles.forEach(handle => toggleNativeDragInteractions(handle, false));
     this._toggleNativeDragInteractions();
+
+    // Delete any lingering disabled handles that may have been destroyed. Note that we re-create
+    // the set, rather than iterate over it and filter out the destroyed handles, because while
+    // the ES spec allows for sets to be modified while they're being iterated over, some polyfills
+    // use an array internally which may throw an error.
+    const disabledHandles = new Set<HTMLElement>();
+    this._disabledHandles.forEach(handle => {
+      if (this._handles.indexOf(handle) > -1) {
+        disabledHandles.add(handle);
+      }
+    });
+    this._disabledHandles = disabledHandles;
     return this;
   }