Add support for 'patterns' library

[ShahriarKh]

It seems like that the patterns library isn't supported. Here's an example (from https://pgfplots.net/filling-pattern-bar-plot/):

%\documentclass[tikz,border=10pt]{standalone}%
\usepackage{pgfplots}
\usetikzlibrary{patterns}

\begin{document}
\begin{tikzpicture}
\begin{axis}[ybar, samples=10, enlarge y limits=upper, ymin=0]
\addplot +[
    black,
    fill=yellow,
    postaction={
        pattern=north east lines
    }
]{rnd};
\end{axis}
\end{tikzpicture}
\end{document}

The same code in Obsidian results in this:

[apetresc]

I would put a bounty on this if I could.

[thecodechemist99]

This seems to be a rendering issue, at least the library files are included in the source code.