fix(autocomplete): updateSize incorrectly sets the size to zero (#11500)

this can break the ability to show the dropdown on focus

Fixes #10834

Author: Splaktar

src/components/virtualRepeat/virtual-repeater.js

@@ -223,10 +223,14 @@ VirtualRepeatContainerController.prototype.updateSize = function() {
   // If the original size is already determined, we can skip the update.
   if (this.originalSize) return;
 
-  this.size = this.isHorizontal()
+  var size = this.isHorizontal()
       ? this.$element[0].clientWidth
       : this.$element[0].clientHeight;
 
+  if (size) {
+    this.setSize_(size);
+  }
+
   // Recheck the scroll position after updating the size. This resolves
   // problems that can result if the scroll position was measured while the
   // element was display: none or detached from the document.