Fix exploration for multiple videos

lib/explore.mjs

@@ -28,21 +28,22 @@ export const exploreVideos = async (videoId, onUpdate) =>
     while (queue.length > 0)
     {
         const currentId = queue.shift();
-        const config = await api.getPlayerConfig(currentId);
-        const meta = api.getVideoMeta(config);
 
-        videosNodes[currentId] = meta;
-        nextVideos[currentId] = new Set();
+        if (!(currentId in videosNodes))
+        {
+            const config = await api.getPlayerConfig(currentId);
+            const meta = api.getVideoMeta(config);
 
-        // Add links between this video and the linked ones
-        api.getEndScreenVideos(config)
-            .forEach(nextId => nextVideos[meta.videoId].add(nextId));
-        api.getCardVideos(config)
-            .forEach(nextId => nextVideos[meta.videoId].add(nextId));
+            videosNodes[currentId] = meta;
+            nextVideos[currentId] = new Set();
 
-        for (let nextId of nextVideos[meta.videoId])
-        {
-            if (!(nextId in videosNodes))
+            // Add links between this video and the linked ones
+            api.getEndScreenVideos(config)
+                .forEach(nextId => nextVideos[meta.videoId].add(nextId));
+            api.getCardVideos(config)
+                .forEach(nextId => nextVideos[meta.videoId].add(nextId));
+
+            for (let nextId of nextVideos[meta.videoId])
             {
                 queue.push(nextId);
             }