AutoFakeSlant does not work when specifying BoldFont

[yuishin-kikuchi]

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Description

AutoFakeSlant does not work when specifying BoldFont. Problem occurs with both xelatex/lualatex.

Check/indicate

• [ chk ] Relevant for XeTeX
• [ chk ] Relevant for LuaTeX
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Minimal example demonstrating the issue

\documentclass{article}
\usepackage[no-math]{fontspec}
\setmainfont{Roboto}[
  UprightFont=*-Regular,
  BoldFont=*-Bold,
  AutoFakeSlant=0.5,
] % I know roboto family has italic and bold italic version.
\begin{document}
{The quick brown fox}\par
{\bfseries The quick brown fox}\par
{\itshape The quick brown fox}\par
{\bfseries\itshape The quick brown fox}\par % why not slanted?
\end{document}

Further details

The code:

\setmainfont{Roboto}[
  UprightFont=*-Regular,
  BoldFont=*-Bold,
  AutoFakeSlant=0.5,
  BoldItalicFeatures={
    Font=*-Bold,
    FakeSlant=0.5,
  }
]

works fine. But this is redundant.