Wt

WTextEdit in vertical layout is always placed at the top when Wt::LayoutImplementation::JavaScript is enabled. This has been the case since version 4.14.0. Here is a small example:

Application::Application(const Wt::WEnvironment& env) : Wt::WApplication(env)
{
  auto l1 = std::make_unique<Wt::WVBoxLayout>();
  l1->setPreferredImplementation(Wt::LayoutImplementation::JavaScript);

  auto b1 = l1->addWidget(std::make_unique<Wt::WPushButton>());
  b1->setText("Top buttton");

  auto e1 = l1->addWidget(std::make_unique<Wt::WTextEdit>());

  auto b2 = l1->addWidget(std::make_unique<Wt::WPushButton>());
  b2->setText("Bottom button");

  root()->setLayout(std::move(l1));
}