Bug 1526667 - Close the Quantumbar popup when the browser window resizes. r=mak

Differential Revision: https://phabricator.services.mozilla.com/D19264

--HG--
extra : moz-landing-system : lando

browser/components/urlbar/UrlbarView.jsm

@@ -497,9 +497,17 @@ class UrlbarView {
 
   _on_popupshowing() {
     this._enableOrDisableOneOffSearches();
+    this.window.addEventListener("resize", this);
   }
 
   _on_popuphiding() {
     this.controller.cancelQuery();
+    this.window.removeEventListener("resize", this);
+  }
+
+  _on_resize() {
+    // Close the popup as it would be wrongly sized. This can
+    // happen when using special OS resize functions like Win+Arrow.
+    this.close();
   }
 }