Keep the installed extension when replacing it fails

Co-authored-by: hamenot <hamenot@users.noreply.github.com>

app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt

@@ -24,6 +24,7 @@ import mihon.domain.extension.model.ContentWarning
 import mihon.domain.extension.model.ExtensionStore
 import tachiyomi.core.common.util.system.logcat
 import java.io.File
+import java.io.IOException
 
 /**
  * Class that handles the loading of the extensions. Supports two kinds of extensions:
@@ -80,12 +81,12 @@ internal object ExtensionLoader {
         }
 
         val target = File(getPrivateExtensionDir(context), "${extension.packageName}.$PRIVATE_EXTENSION_EXTENSION")
+        val staged = File(target.parentFile, "${target.name}.part")
         try {
-            target.delete()
-            file.copyAndSetReadOnlyTo(target, overwrite = true)
-        } catch (e: Exception) {
-            target.delete()
-            throw e
+            file.copyAndSetReadOnlyTo(staged, overwrite = true)
+            if (!staged.renameTo(target)) throw IOException("Unable to replace ${target.name}")
+        } finally {
+            staged.delete()
         }
         if (currentExtension != null) {
             ExtensionInstallReceiver.notifyReplaced(context, extension.packageName)