How can I disable/remove the shadow of hover text

[wangxiaochuTHU]

I used on_hover_text_at_pointer for showing some hovering text, but it looks that a shadow is also shown around the hovering text. I've tried to explicit set the shadow to Shadow::NONE, but that didn't help. So how can I disable the shadow? Thank you.

let frame : Frame = Frame::none().shadow(Shadow::NONE);
egui::CentralPanel::default().frame(frame)
        .show(ctx, |ui| {
        /* painting several widgets here*/
        })
        .response
        .on_hover_text_at_pointer( RichText::new("32872").background_color(Color32::TRANSPARENT) )

[YgorSouza]

The hover text shadow is controlled by Visuals::popup_shadow. It also controls the shadow on context menus and combo box drawers. But the window shadow is a separate field.

ctx.style_mut(|style| style.visuals.popup_shadow = Shadow::NONE);