[gnome-games] Don't start collection loading twice

[Alexander Mikhaylenko <alexm src gnome org>]

commit c9fb107f59e180e0f23c91560a4d75af3db5c0ad
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Nov 15 03:43:11 2019 +0500

    Don't start collection loading twice
    
    Oops

 src/core/game-collection.vala | 12 +++++++++---
 src/ui/application.vala       |  3 +++
 2 files changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/src/core/game-collection.vala b/src/core/game-collection.vala
index d7732849..b09b433a 100644
--- a/src/core/game-collection.vala
+++ b/src/core/game-collection.vala
@@ -13,6 +13,7 @@ private class Games.GameCollection : Object {
        private HashTable<Platform, Array<RunnerFactory>> runner_factories_for_platforms;
 
        public bool paused { get; set; }
+       private SourceFunc search_games_cb;
 
        construct {
                games = new GenericSet<Game> (Game.hash, Game.equal);
@@ -77,26 +78,31 @@ private class Games.GameCollection : Object {
        }
 
        public async void search_games () {
-               SourceFunc callback = search_games.callback;
+               if (search_games_cb != null)
+                       return;
+
+               search_games_cb = search_games.callback;
 
                ThreadFunc<void*> run = () => {
                        foreach (var source in sources)
                                foreach (var uri in source) {
                                        if (paused) {
-                                               Idle.add ((owned) callback);
+                                               Idle.add ((owned) search_games_cb);
                                                return null;
                                        }
 
                                        add_uri (uri);
                                }
 
-                       Idle.add ((owned) callback);
+                       Idle.add ((owned) search_games_cb);
                        return null;
                };
 
                new Thread<void*> (null, (owned) run);
 
                yield;
+
+               search_games_cb = null;
        }
 
        public Runner? create_runner (Game game) {
diff --git a/src/ui/application.vala b/src/ui/application.vala
index a9a1e726..e9106291 100644
--- a/src/ui/application.vala
+++ b/src/ui/application.vala
@@ -349,6 +349,9 @@ public class Games.Application : Gtk.Application {
        }
 
        public void set_pause_loading (bool paused) {
+               if (game_collection.paused == paused)
+                       return;
+
                game_collection.paused = paused;
 
                if (!paused)