Fixed downloading after revisiting cached manga

app/build.gradle

@@ -38,7 +38,7 @@ android {
         minSdkVersion 16
         targetSdkVersion 31
         versionCode 69
-        versionName "5.2.24"
+        versionName "5.2.25"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }

app/release/output-metadata.json

@@ -12,7 +12,7 @@
       "filters": [],
       "attributes": [],
       "versionCode": 69,
-      "versionName": "5.2.23",
+      "versionName": "5.2.25",
       "outputFile": "app-release.apk"
     }
   ],

app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt

@@ -229,8 +229,10 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
             return@launch
 
         (lock[galleryID] ?: Mutex().also { lock[galleryID] = it }).withLock {
-            if (downloadFolder.exists()) downloadFolder.deleteRecursively()
-            downloadFolder.mkdir()
+            if (downloadFolder.exists() && downloadFolder.list().isNullOrEmpty()) {
+                downloadFolder.deleteRecursively()
+                downloadFolder.mkdir()
+            }
 
             val cacheMetadata = cacheFolder.getChild(".metadata")
             val downloadMetadata = downloadFolder.getChild(".metadata")