https://bugs.winehq.org/show_bug.cgi?id=40554
--- Comment #8 from godevilove godevilove@ya.ru --- I've just noticed that I've made a mistake in the initial post: [Default, Active4D, Earth, iPlastic, Lazy, Mac Classic, Solarized Light] - these themes have a visible caret. [Bespin, Cobalt, Dawn, Monokai, Obsidian, Solarized Dark, SpaceCadet, Sunburst, Twilight, Zenburn] - these themes don't have a visible caret.
It also turned out that the caret is visible only if it's black.