Fix prefetched navigation

vlc-android/src/org/videolan/vlc/providers/BrowserProvider.kt

@@ -258,6 +258,10 @@ abstract class BrowserProvider(val context: Context, val dataset: LiveDataset<Me
         loading.value = false
     }
 
+    protected fun getList(url: String) =  prefetchLists[url]
+
+    protected fun removeList(url: String) =  prefetchLists.remove(url)
+
     fun saveList(media: MediaWrapper) = foldersContentMap[media]?.let { if (!it.isEmpty()) prefetchLists[media.location] = it }
 
     fun isFolderEmpty(mw: MediaWrapper) = foldersContentMap[mw]?.isEmpty() ?: true

vlc-android/src/org/videolan/vlc/providers/NetworkProvider.kt

@@ -49,13 +49,20 @@ class NetworkProvider(context: Context, dataset: LiveDataset<MediaLibraryItem>,
     override fun fetch() {}
 
     override fun refresh(): Boolean {
+        val list by lazy(LazyThreadSafetyMode.NONE) { getList(url!!) }
         return if (url == null) {
             dataset.value = mutableListOf<MediaLibraryItem>().apply {
                 getFavoritesList(favorites?.value)?.let { addAll(it) }
             }
             launch { browseRoot() }
             true
+        } else if (list !== null) {
+            dataset.value = list as MutableList<MediaLibraryItem>
+            removeList(url)
+            parseSubDirectories()
+            true
         } else super.refresh()
+
     }
 
     override fun parseSubDirectories() {