fix slow manga thumbnails issue, next manga reset page issue

server/src/main/kotlin/ir/armor/tachidesk/impl/util/CachedImageResponse.kt

@@ -23,8 +23,9 @@ object CachedImageResponse {
     }
 
     private fun findFileNameStartingWith(directoryPath: String, fileName: String): String? {
+        val target = "$fileName."
         File(directoryPath).listFiles().forEach { file ->
-            if (file.name.startsWith("$fileName."))
+            if (file.name.startsWith(target))
                 return "$directoryPath/${file.name}"
         }
         return null

server/src/main/kotlin/ir/armor/tachidesk/server/JavalinSetup.kt

@@ -36,9 +36,8 @@ import ir.armor.tachidesk.impl.backup.legacy.LegacyBackupImport.restoreLegacyBac
 import ir.armor.tachidesk.server.internal.About.getAbout
 import ir.armor.tachidesk.server.util.openInBrowser
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.future.future
+import kotlinx.coroutines.newFixedThreadPoolContext
 import mu.KotlinLogging
 import java.io.IOException
 import java.text.SimpleDateFormat
@@ -55,7 +54,9 @@ import kotlin.concurrent.thread
 
 object JavalinSetup {
     private val logger = KotlinLogging.logger {}
-    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+
+    @kotlinx.coroutines.ObsoleteCoroutinesApi
+    private val scope = CoroutineScope(newFixedThreadPoolContext(200, "javalin-future"))
 
     private fun <T> future(block: suspend CoroutineScope.() -> T): CompletableFuture<T> {
         return scope.future(block = block)