Method cancel_theme_preview

src/apps/cli/src/ui/startup.rs:1706–1710

(&mut self)

    }

    fn cancel_theme_preview(&mut self) {
        if let Some(original) = self.theme_preview_original.take() {
            self.theme = original;
        }
    }

    fn preview_theme_selection(&mut self, theme: &ThemeItem) {
        self.begin_theme_preview();