`calc()` in arbitrary class name missing spaces around `-`

[wongjn]

What version of Tailwind CSS are you using?

v4.1.9

What build tool (or framework if it abstracts the build tool) are you using?

Tailwind Play

What version of Node.js are you using?

N/a

What browser are you using?

Chrome, Firefox

What operating system are you using?

Windows

Reproduction URL

https://play.tailwindcss.com/VL4wmKtq0r

Describe your issue

Seems like work in #18220 may have introduced some regressions in whitespace handling in calc().

For w-[calc(100%-var(--foo))], we get:

width: calc(100%-var(--foo));

But I would expect:

width: calc(100% - var(--foo));

Source: https://discord.com/channels/486935104384532500/1382440930182828104

[RobinMalfait]

Hey!

This has been fixed by #18289 and will be available in the next release (in progress).