优化

app/src/main/java/io/legado/app/data/entities/BookSource.kt

@@ -13,6 +13,7 @@ import kotlinx.parcelize.Parcelize
 import splitties.init.appCtx
 import java.io.InputStream
 
+@Suppress("unused")
 @Parcelize
 @TypeConverters(BookSource.Converters::class)
 @Entity(
@@ -161,7 +162,7 @@ data class BookSource(
 
     fun removeGroup(groups: String): BookSource {
         bookSourceGroup?.splitNotBlank(AppPattern.splitGroupRegex)?.toHashSet()?.let {
-            it.removeAll(groups.splitNotBlank(AppPattern.splitGroupRegex))
+            it.removeAll(groups.splitNotBlank(AppPattern.splitGroupRegex).toSet())
             bookSourceGroup = TextUtils.join(",", it)
         }
         return this