Content space of Metropolis's title slide option is not handling relative type correctly

[tapyu]

#import "@preview/polylux:0.3.1": *
#import themes.metropolis: *

#show: metropolis-theme.with(
  footer: [Custom footer]
)

#set text(font: "Fira Sans", weight: "light", size: 20pt)

#title-slide(
  author: [Authors],
  title: "Title",
  subtitle: "Subtitle",
  date: "Date",
  extra: [
    #box(width: 100%, height: 100%, fill: blue)[
      #align(bottom)[
        test
      ]
    ]
  ]
)

test should be in the bottom of the title slide. Instead, I new slide was created... #title-slide should make its entries aware of how much space there is within the current slide. This is clearly not the case because a box with 100% in height and weight creates a space that cover the next slide totally.

[andreasKroepelin]

I think what you want is a height of 1fr which, if not possible now, will become possible in the next Typst version.

[tapyu]

Fraction type is not allowed for #box's height.

will become possible in the next Typst version.

Do you have any issue or PR reference for that?

[tapyu]

#slide(title: "Motivation")[
  #grid(
    columns: (1fr, 1fr),
    gutter: 10pt,
    box(width: 100%, height: 100%, fill: blue)[
        test
    ],
    box(width: 100%, height: 100%, fill: blue)[
        test
    ]
  )
]

Note that, in functions such as #grid, relative values are assessed with respect to the space reserved to its content, not the whole page space. I think #title-slide should have the same behavior for the sake of consistency.