fix nepnep thumbnails (#12654)

multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/nepnep/NepNep.kt

@@ -95,13 +95,24 @@ abstract class NepNep(
                 SManga.create().apply {
                     title = directory[i].getString("s")!!
                     url = "/manga/${directory[i].getString("i")}"
-                    thumbnail_url = "https://cover.nep.li/cover/${directory[i].getString("i")}.jpg"
+                    thumbnail_url = getThumbnailUrl(directory[i].getString("i")!!)
                 }
             )
         }
         return MangasPage(mangas, endRange < directory.lastIndex)
     }
 
+    private var thumbnailUrl: String? = null
+
+    private fun getThumbnailUrl(id: String): String {
+        if (thumbnailUrl.isNullOrEmpty()) {
+            val response = client.newCall(popularMangaRequest(1)).execute()
+            thumbnailUrl = response.asJsoup().select(".SearchResult > .SearchResultCover img").first().attr("ng-src")
+        }
+
+        return thumbnailUrl!!.replace("{{Result.i}}", id)
+    }
+
     // Latest
 
     override fun fetchLatestUpdates(page: Int): Observable<MangasPage> {

multisrc/src/main/java/eu/kanade/tachiyomi/multisrc/nepnep/NepNepGenerator.kt

@@ -9,7 +9,7 @@ class NepNepGenerator : ThemeSourceGenerator {
 
     override val themeClass = "NepNep"
 
-    override val baseVersionCode: Int = 9
+    override val baseVersionCode: Int = 10
 
     override val sources = listOf(
         SingleLang("MangaSee", "https://mangasee123.com", "en", overrideVersionCode = 20),