Inspection errors when common commands are defined in custom packages

[fberlakovich]

Type of JetBrains IDE (IntelliJ, PyCharm, etc.) and version

IntelliJ 2020.3

Operating System

Windows

TeXiFy IDEA version

0.7.2

What I did (steps to reproduce)

See the minimal example

Minimal example to reproduce the problem

\documentclass{article}
\pdfpagewidth=8.5in
\pdfpageheight=11in
\usepackage{ijcai20} % no 21 version yet

\newcommand{\citet}[1]{\citeauthor{#1} \shortcite{#1}}

\begin{document}
    \citet{X}
\end{document}

Files in src:

• main.tex
• ijcai20.sty
• named.bst

The package ijcai20 can be found under this link: https://www.ijcai.org/authors_kit (I am not sure whether I am allowed to upload it here). The example can probably be reduced further, but I lack the skills to do so.

Expected behavior

No errors since \citeauthor is defined in the package and \citet is defined with \newcommand

Actual behavior

\citet and \citeauthor are displayed in red and \newcommand is underlined in red. The error for \newcommand is "Command is already defined" and for \citet "Command requires natbib package". TeXiFy-IDEA seems to miss that \citeauthor is defined in ijcai20.sty.