Double lines and tables: a feature request?

General
1

This is based off a question asked on the forum here, but my question is instead: should I post a feature request for this? (Based on this question.)

A feature request for a line stroke that produces a double line.

  • Because to draw double lines in tables, we need to use multiple rows
    • But then the double line can not be above the table.header
  • Because drawing double lines with a tiling makes the line too wide, see below

Picture: this is pretty good, there is a double line above the table.header drawn with a tiling. But because of stroke width (of the tiling, not of the lines), it juts out wider than the regular table.hline

bild

#let dhpat(sep, stroke) = tiling(
  size: (10pt, (sep + std.stroke(stroke).thickness) * 10),
  {
    let t = std.stroke(stroke).thickness / 2 + 0.1pt
    let theline = line(length: 10pt, stroke: stroke)
    place(dy: t, theline)
    place(dy: t + sep, theline)
  }
)

// problem: the top double line is longer than the table.hlines()
#set table.hline(stroke: 0.08em)
#table(
  columns: 2,
  stroke: (x, y) => 0pt,
  align: (left, center),
  table.hline(stroke: (thickness: 6pt, paint: dhpat(2pt, 0.8pt), cap: "butt")),
  table.header([Mach range], [Flow physics]),
  table.hline(),
  $M_p <= 0.1$, [Incompressible],
  $0.1 <= M_p <= 0.65$, [Compressible],
  table.hline(),
  table.cell(colspan: 2, inset: 0.12em, {}),
  table.hline(),
)
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2

If you want to use a feature that is built into Typst, create a feature request. All details about it can be discussed there.

Also, the topic feels unnecessary in General, as even the title tells me that it belongs to Questions.

3

The question is not strictly speaking about using Typst, so it’s fine in General. I believe @bluss is asking whether or not to create an issue on typst/typst.

As for the question, I think it’s best to create an issue to reference the difficult of double lines in tables. Maybe it can be solved without implementing specifically double line stroke :person_shrugging:.

Clearly, there is something missing because it shouldn’t be that hard. I would probably expect two consecutive hline to merge together in a sensible manner.

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