How can i do a crossed over/under brace?

[szdytom]

In Latex, I'll do:

$\rlap{\overbrace{\phantom{a+b+c+d}}^{1}}{a+\underbrace{b+c+d+e}_{2}}$

what i tried in typst:

#let rlap(content1, content2) = box({
	content1
	place(
		top + left,
		content2
	)
})

$ rlap(overbrace(#hide[a+b+c+d], "1"), a+underbrace(b+c+d+e, "2")) $

however, the overbrace is not placed in the correct position. i tried to define my own phantom:

#let phantom(body) = style(styles => {
	let sz = measure(body, styles)
	box(width: sz.width, height: sz.height)
})

$ rlap(overbrace(#phantom[a+b+c+d], "1"), a+underbrace(b+c+d+e, "2")) $

but that don't work either. Maybe typst need a offical impl of rlap?

[PgBiel]

Regarding overlapping, see #682, which suggests a workaround. I'm currently working on an in-library implementation; I should hopefully be able to PR within the next week.

Regarding #hide failing (if you're facing that at the latest release), see #795 (currently not fixed).

[szdytom]

do

#let rlap(content1, content2) = style(sty => {
	let w1 = measure(content1, sty).width
	let w2 = measure(content2, sty).width
	content1
	h(-w1)
	content2
	h(calc.max(w1, w2) - w2)
})

$ rlap(overbrace(#hide[a+b+c+d], "1"), a+underbrace(b+c+d+e, "2")) $