Certain calc fields not generated correctly

[JasonBarnabe]

semantic-ui-less 2.4.1
less 3.9.0
Running in a Rails 5.2 app using webpacker 3.5.5.

Semantic-UI-LESS/themes/default/elements/step.variables

Line 98 in e439521

@attachedWidth: calc(100% + (-@attachedHorizontalOffset * 2));

@borderWidth: 1px;
@attachedHorizontalOffset: -@borderWidth;
@attachedWidth: calc(100% + (-@attachedHorizontalOffset * 2));

results in @attachedWidth being calc(100% + (--1px * 2)), which is not valid.

I'm only having this happen in my development environment. Possibly a minifier/compressor is correcting to calc(100% + 2px).

Adding this override fixes it:

@attachedWidth: calc(100% + (@attachedHorizontalOffset * -2));

[meze]

Having the same problem with attached.segment. Solved it temporarily by overriding the theme's variables:

@attachedWidth: calc(~"100% - (" @attachedHorizontalOffset ~"* 2)");

less calculates the value but it should be the expression, not the result of it.