Wt

Affected: WPopupMenu of Wt 4.11.4 (regardless of Gecko or Chromium engine)
STR:

  unique_ptr<WPopupMenu> submenu{make_unique<WPopupMenu>()};
  submenu->addItem("subitem with longer label 1111111111111111111");
  unique_ptr<WPopupMenu> dropdown{make_unique<WPopupMenu>()};
  dropdown->addItem("submenu")->setMenu(move(submenu));
  unique_ptr<WMenu> mainmenu{make_unique<WMenu>()};
  mainmenu->addMenu("item", move(dropdown));

• make browser window very narrow
• click "item"
• hover or click "submenu" --> nothing happens