message: Multi-cursor replace mode
  This needs tests, but I'm foregoing them until a framework for easily testing multi-cursor behavior is available (see
  Fixes
diff: @@ -1309,6 +1309,12 @@ export class ModeHandler implements vscode.Disposable {
  }
  break;
  }
  + case Mode.Replace: {
  + selections = vimState.cursors.map((c: Range) => {
  + return new vscode.Selection(c.start, c.stop);
  + });
  + break;
  + }
  default: {
  this._logger.error(`unexpected selection mode. selectionMode=${selectionMode}`);
  break;
  