[gnome-shell] status/keyboard: Reset menuItems and Label objects on change

[Marco Trevisan <marcotrevi src gnome org>]

commit a46af9edf0b99b64501617a1159bc1beb9af218f
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Sat Oct 28 02:23:02 2017 -0500

    status/keyboard: Reset menuItems and Label objects on change
    
    In the current code it could happen that we've menuItems and indicatorLabels
    for sources that aren't anymore around, because in case a source is removed
    we don't cleanup the their container objects.
    Also, we should nullify InputManager's _currentSource when sources change
    or it might point to some invalid data again.
    
    So it could happen that we try to access an invalid menuitem or label
    if a source change happens mentioning a source that has been deleted.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=788931

 js/ui/status/keyboard.js |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 70e6abf..b2f1032 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -529,6 +529,7 @@ var InputSourceManager = new Lang.Class({
         let sources = this._settings.inputSources;
         let nSources = sources.length;
 
+        this._currentSource = null;
         this._inputSources = {};
         this._ibusSources = {};
 
@@ -827,6 +828,9 @@ var InputSourceIndicator = new Lang.Class({
         for (let i in this._indicatorLabels)
             this._indicatorLabels[i].destroy();
 
+        this._menuItems = {};
+        this._indicatorLabels = {};
+
         let menuIndex = 0;
         for (let i in this._inputSourceManager.inputSources) {
             let is = this._inputSourceManager.inputSources[i];