优化

app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt

@@ -59,24 +59,13 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
     }.map { docList ->
         when (sort) {
             2 -> docList.sortedWith(
-                compareBy(
+                compareBy({ !it.isDir }, { it.date }, { it.name })
-                    { !it.isDir },
-                    { it.date },
-                    { it.name }
-                )
             )
             1 -> docList.sortedWith(
-                compareBy(
+                compareBy({ !it.isDir }, { it.size }, { it.name })
-                    { !it.isDir },
-                    { it.size },
-                    { it.name }
-                )
             )
             else -> docList.sortedWith(
-                compareBy(
+                compareBy({ !it.isDir }, { it.name })
-                    { !it.isDir },
-                    { it.name }
-                )
             )
         }
     }.flowOn(IO)