[gnome-shell] altTab: Use this._highlighted instead of this._curApp in AppSwitcher

[Marge Bot <marge-bot src gnome org>]

commit 7ae694990b871dbb3407ac974220ff182c56f386
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Mon Apr 30 01:06:35 2018 +0200

    altTab: Use this._highlighted instead of this._curApp in AppSwitcher
    
    Thanks to the parent class (SwitcherPopup), we already have a property
    for the currently highlighted item, let's use it.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2097>

 js/ui/altTab.js | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index dacd9bec67..c03c680c33 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -706,7 +706,6 @@ class AppSwitcher extends SwitcherPopup.SwitcherList {
                 this._addIcon(appIcon);
         }
 
-        this._curApp = -1;
         this._altTabPopup = altTabPopup;
         this._mouseTimeOutId = 0;
 
@@ -829,21 +828,20 @@ class AppSwitcher extends SwitcherPopup.SwitcherList {
     // show a dim arrow, but show a bright arrow when they are
     // highlighted.
     highlight(n, justOutline) {
-        if (this.icons[this._curApp]) {
-            if (this.icons[this._curApp].cachedWindows.length == 1)
-                this._arrows[this._curApp].hide();
+        if (this.icons[this._highlighted]) {
+            if (this.icons[this._highlighted].cachedWindows.length === 1)
+                this._arrows[this._highlighted].hide();
             else
-                this._arrows[this._curApp].remove_style_pseudo_class('highlighted');
+                this._arrows[this._highlighted].remove_style_pseudo_class('highlighted');
         }
 
         super.highlight(n, justOutline);
-        this._curApp = n;
 
-        if (this._curApp != -1) {
-            if (justOutline && this.icons[this._curApp].cachedWindows.length == 1)
-                this._arrows[this._curApp].show();
+        if (this._highlighted !== -1) {
+            if (justOutline && this.icons[this._highlighted].cachedWindows.length === 1)
+                this._arrows[this._highlighted].show();
             else
-                this._arrows[this._curApp].add_style_pseudo_class('highlighted');
+                this._arrows[this._highlighted].add_style_pseudo_class('highlighted');
         }
     }