tweaks (#2100)

* mod: pgc episode title

* opt: ColorScheme.of

* mod: mpv api version

* opt: log handler

* opt: ext

lib/utils/extension/file_ext.dart

@@ -1,11 +1,8 @@
 import 'dart:io' show FileSystemEntity, Directory;
 
 extension FileSystemEntityExt on FileSystemEntity {
-  Future<void> tryDel({bool recursive = false}) async {
-    try {
-      await delete(recursive: recursive);
-    } catch (_) {}
-  }
+  Future<void> tryDel({bool recursive = false}) =>
+      delete(recursive: recursive).catchError((_) => this);
 }
 
 extension DirectoryExt on Directory {

lib/utils/extension/iterable_ext.dart

@@ -14,13 +14,6 @@ extension IterableExt<T> on Iterable<T> {
     }
     return value;
   }
-
-  T? firstWhereOrNull(bool Function(T element) test) {
-    for (final element in this) {
-      if (test(element)) return element;
-    }
-    return null;
-  }
 }
 
 extension ListExt<T> on List<T> {
@@ -69,6 +62,6 @@ extension ListExt<T> on List<T> {
 
   T? getOrNull(int index) {
     if (index < 0 || index >= length) return null;
-    return elementAt(index);
+    return this[index];
   }
 }