Bug 1575651 - Improve megabar behaviour when ui.popup.disable_autohide is enabled. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D43079

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

browser/components/urlbar/UrlbarInput.jsm

@@ -890,7 +890,7 @@ class UrlbarInput {
   endLayoutBreakout(force) {
     if (
       !force &&
-      (this.isOpen ||
+      (this.view.isOpen ||
         (this.focused && !this.textbox.classList.contains("hidden-focus")))
     ) {
       return;