Fix IndexError in operate-and-get-next command

Author: qweeze

prompt_toolkit/key_binding/bindings/named_commands.py

@@ -561,7 +561,8 @@ def operate_and_get_next(event):
 
  # Set the new index at the start of the next run.
  def set_working_index():
- buff.working_index = new_index
+ if new_index < len(buff._working_lines):
+ buff.working_index = new_index
 
  event.cli.pre_run_callables.append(set_working_index)