pub fn push_sgr(out: &mut String, style: Style)Expand description
Appends the SGR codes for style’s non-default foreground/background to out, as a
single \x1b[...m sequence.
A Color::Default channel is left unset, relying on the caller’s preceding \x1b[0m
reset rather than emitting an explicit 39/49 reset code. Emits nothing at all when
both channels are Color::Default.