[gnome-shell/wip/carlosg/mru-initialization] status: Ignore prior single-element lists updating input sources MRU

[Carlos Garnacho <carlosg src gnome org>]

commit b1f628dc2113effe3d8b261c5b8d6fb9e71cafcc
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Sep 19 22:35:15 2022 +0200

    status: Ignore prior single-element lists updating input sources MRU
    
    Consider the existing input sources MRU only valid if it contained
    more than one element to pick from. Fixes the following situation
    with initial-setup sessions:
    
    - Initial setup Session starts, with several input sources already
      configured ("us" between them)
    - InputSourceManager initializes, only the default "us" keymap is
      available
    - MRU list is constructed, "us" is picked
    - InputSourceManager catches up with session configuration, the
      other extra sources are added
    - MRU list is reconstructed, "us" is already the most recent
    - Session ends up with "us" picked, regardless of its position in
      the list, and no MRU existing prior to startup
    
    If we consider the intermediate single-element MRU list invalid,
    it is still possible to pick the best default source between all
    the configured ones (the one that was put first in the list,
    basically), after initialization is complete.
    
    But also, it is unnecessary to have if there is a single source to
    pick from. After the sources list has two elements of more, the
    MRU list will become effective and preserved during changes to
    the available sources.
    
    Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5873

 js/ui/status/keyboard.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index 65b3962731..cb46e11939 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -524,15 +524,18 @@ var InputSourceManager = class extends Signals.EventEmitter {
         }
 
         let mruSources = [];
-        for (let i = 0; i < this._mruSources.length; i++) {
-            for (let j = 0; j < sourcesList.length; j++) {
-                if (this._mruSources[i].type == sourcesList[j].type &&
-                    this._mruSources[i].id == sourcesList[j].id) {
-                    mruSources = mruSources.concat(sourcesList.splice(j, 1));
-                    break;
+        if (this._mruSources.length > 1) {
+            for (let i = 0; i < this._mruSources.length; i++) {
+                for (let j = 0; j < sourcesList.length; j++) {
+                    if (this._mruSources[i].type == sourcesList[j].type &&
+                        this._mruSources[i].id == sourcesList[j].id) {
+                        mruSources = mruSources.concat(sourcesList.splice(j, 1));
+                        break;
+                    }
                 }
             }
         }
+
         this._mruSources = mruSources.concat(sourcesList);
     }