LibGUI: Add 'on_rename_successful' callback to FileSystemModel

Author: https://github.com/mrkct
Commit: 05630d2d5d
Pull-request: https://github.com/SerenityOS/serenity/pull/10153
Reviewed-by: https://github.com/itamar8910 ✅

Userland/Libraries/LibGUI/FileSystemModel.h

@@ -118,6 +118,7 @@ public:
     Function<void()> on_complete;
     Function<void(int error, char const* error_string)> on_directory_change_error;
     Function<void(int error, char const* error_string)> on_rename_error;
+    Function<void(String const& old_name, String const& new_name)> on_rename_successful;
 
     virtual int tree_column() const override { return Column::Name; }
     virtual int row_count(ModelIndex const& = ModelIndex()) const override;