grid context that formats text as-is

[teunbrand]

Summary

This PR aims to fix #1701. Briefly, it swaps the html context for grid context in as_gtable().
This context will format text with as.character() only, to avoid the html escape mechanism that renders poorly in graphics.

Please be forewarned that I only have a partial understanding of how contexts work in {gt}, so somebody who is more familiar should double-check whether this is the correct approach.

Here is a reprex from the linked issue, notice that the symbols on the left are now rendered as actual symbols.

library(tibble)
devtools::load_all("~/packages/gt")
#> ℹ Loading gt

# symbol
gt0 <- tibble(symbol = c(">", "%", "£", "&")
              , value = c(100, 200, 300, 400)) |> 
  gt() |> 
  fmt_currency(currency = "GBP") |>
  as_gtable() |>
  plot()

^{Created on 2024-06-20 with reprex v2.1.0}

The currency formatting is still quite poor as it displays 'GBP' instead of '£', but I'm not familiar enough with the codebase to know where this should be fixed (the 'how' is just passing unicode symbols).

Related GitHub Issues and PRs

• Ref: as_gtable() does not render html math symbols  #1701

Checklist

• I understand and agree to the Code of Conduct.
• I have listed any major changes in the NEWS.
• I have added testthat unit tests to tests/testthat for any new functionality.

[rich-iannone]

Thank you!

[olivroy]

I am working on a PR (#1788).

I am able to achieve the following