Bug 1395438 - The bookmarks panel should fade out when it times out, not close abruptly. r=adw

MozReview-Commit-ID: 2alzsK8M9Xb

--HG--
extra : rebase_source : 94deabb9f416ce4f84d42c864bda6ffe9052c62b

browser/base/content/browser-places.js

@@ -250,7 +250,7 @@ var StarUI = {
           clearTimeout(this._autoCloseTimer);
           this._autoCloseTimer = setTimeout(() => {
             if (!this.panel.mozMatchesSelector(":hover")) {
-              this.panel.hidePopup();
+              this.panel.hidePopup(true);
             }
           }, delay);
           this._autoCloseTimerEnabled = true;