[gnome-shell] search-results: Fix flickering of the selection

[Florian Müllner <fmuellner src gnome org>]

commit f0622c1896dd835755c8ada7fb4a6dae8966e11f
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Apr 8 16:48:33 2011 +0200

    search-results: Fix flickering of the selection
    
    When updating search results, the current result set is
    recreated from scratch before setting the selection
    highlight. This results in two style changes of the selected
    item, and as a CSS transition is used to animate the style
    change, the selected item flickers if it remains the same as
    with the previous search term.
    Fix by hiding the result set until the selection is set, to
    avoid the transition in that case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=646019

 js/ui/searchDisplay.js |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/searchDisplay.js b/js/ui/searchDisplay.js
index ffe9fa4..7b0a3d1 100644
--- a/js/ui/searchDisplay.js
+++ b/js/ui/searchDisplay.js
@@ -333,6 +333,13 @@ SearchResults.prototype = {
         let terms = this._searchSystem.getTerms();
         this._openSearchSystem.setSearchTerms(terms);
 
+        // To avoid CSS transitions causing flickering
+        // of the selection when the first search result
+        // stays the same, we hide the content while
+        // filling in the results and setting the initial
+        // selection.
+        this._content.hide();
+
         for (let i = 0; i < results.length; i++) {
             let [provider, providerResults] = results[i];
             let meta = this._metaForProvider(provider);
@@ -343,6 +350,8 @@ SearchResults.prototype = {
         if (this._selectedOpenSearchButton == -1)
             this.selectDown(false);
 
+        this._content.show();
+
         return true;
     },