[FEATURE] keep linking of less vars for css vars

[petermuessig]

No description provided.

[petermuessig]

Hi @matz3

I enhanced the generation of the CSS variables to keep the linking of the raw variable assignment, e.g.

@sapUiFontFamily: @sapFontFamily

:root {
  --sapUiFontFamily: @sapUiFontFamily
}

results in:

: root {
  --sapUiFontFamily: var(--sapFontFamily);
}

This ensures to make the pure linked variables also dependent on the base variables. The calculations will be handled as static values. Here we cannot benefit from the variables feature right now. Maybe something for the future when more calc functions will be available in the browser.

THX and BR,
Peter