message: Throw E20 if trying to use file mark with operator across files
diff: @@ -690,6 +690,10 @@ class MarkMovementBOL extends BaseMovement {
  vimState.currentRegisterMode = RegisterMode.LineWise;
  if (mark.isUppercaseMark && mark.editor !== undefined) {
  + if (vimState.recordedState.operator && mark.editor !== vimState.editor) {
  + // Operators don't work across files
  + throw VimError.fromCode(ErrorCode.MarkNotSet);
  + }
  await ensureEditorIsActive(mark.editor);
  }
  