Bug 1424469 - The Downloads view in the Library window doesn't get focus when opened. r=mak

We have to keep track of the focused element while we remove the richlistbox element temporarily.

MozReview-Commit-ID: AePydUyyUS7

--HG--
extra : rebase_source : 1dbab87a07a4d95780e0abf29efec94ea73344cf
extra : amend_source : 6e685a648e0ba674eba791e1dc7138f67bd7f1e0

browser/components/downloads/content/allDownloadsViewOverlay.js

@@ -429,11 +429,15 @@ DownloadsPlacesView.prototype = {
       xblFields.set(key, value);
     }
 
+    let oldActiveElement = document.activeElement;
     let parentNode = this._richlistbox.parentNode;
     let nextSibling = this._richlistbox.nextSibling;
     parentNode.removeChild(this._richlistbox);
     this._richlistbox.prepend(this.batchFragment);
     parentNode.insertBefore(this._richlistbox, nextSibling);
+    if (oldActiveElement && oldActiveElement != document.activeElement) {
+      oldActiveElement.focus();
+    }
 
     for (let [key, value] of xblFields) {
       this._richlistbox[key] = value;