Function ime_underline 

pub fn ime_underline(
    child: impl IntoUiNode,
    thickness: impl IntoVar<UnderlineThickness>,
    style: impl IntoVar<LineStyle>,
) -> UiNode

P Style and thickness of the line drawn under the IME preview text.

Sets the IME_UNDERLINE_THICKNESS_VAR and IME_UNDERLINE_STYLE_VAR.