$navbar-bg no longer defaulting to $primary in v1.4.455

[EllaKaye]

Bug description

The $navbar-bg colour no longer defaults to $primary in the pre-release (v1.4.455). This behaviour is different than in the current release, where it does default to $primary.

I'm not sure if this is a bug or a deliberate design decision change. The documentation still states that $navbar-bg should default to $primary, though the documentation is of course for the current release not the pre-release. If it is a deliberate change, I don't see it listed on the pre-release notes (unless I'm missing something).

Steps to reproduce

See https://github.com/EllaKaye/navbar-bug and the corresponding site at https://ellakaye.github.io/navbar-bug/.

This is created by starting a new Quarto website project within RStudio, then adding a custom.scss file with

/*-- scss:defaults --*/
$aubergine: #552D62;
$primary:   $aubergine !default;

and linking to it appropriately in _quarto.yml:

format:
  html:
    theme: [cosmo, custom.scss]

Expected behavior

The navbar should default to the primary colour (aubergine).

Explicitly adding $navbar-bg: $primary; does change the colour.

Actual behavior

The navbar remains the default colour for the cosmo theme, not the custom theme. If I remove cosmo from the theme listing, the navbar defaults to blue (also not in custom.scss!)

The link colour on the site is $primary, so the theme is getting picked up elsewhere.

Your environment

• IDE: RStudio 2023.09.1+494
• MacOS: Ventura 13.6

Quarto check output

Quarto 1.4.455
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.8: OK
      Dart Sass version 1.55.0: OK
      Deno version 1.33.4: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.4.455
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2022.11
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/u2175871/Library/TinyTeX/bin/universal-darwin
      Version: 2022

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.6
      Path: /Library/Developer/CommandLineTools/usr/bin/python3
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

[✓] Checking R installation...........OK
      Version: 4.3.1
      Path: /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources
      LibPaths:
        - /Users/u2175871/Library/R/arm64/4.3/library
        - /Library/Frameworks/R.framework/Versions/4.3-arm64/Resources/library
      knitr: 1.43
      rmarkdown: 2.22

[✓] Checking Knitr engine render......OK