Rendering issue when using equal signs on lines

[libre-man]

There seems to be a problem when rendering math blocks which contains equal signs (=) on a single line. It seems to interpret this as a heading (this is done by the lheading parse rule in markdown-it), screwing up the entire rendering of the output.

Example input which shows this behavior:

$\begin{pmatrix}
1 & 2 \\
3 & 4
\end{pmatrix}
\begin{pmatrix}4 & 5\end{pmatrix}
=
\begin{pmatrix}6 & 7\end{pmatrix}$

Disabling the lheading rule in block (md.block.ruler.disable(['lheading'])) fixes the issue, but this breaks al headings of this kind (as expected).

[libre-man]

I did some further investigation into this issue. It seems like you can prevent something from being rendered as a lheading by registering as an alt for the paragraph rule. If you indicate that a block can be rendered by your rule it skips that block from being rendered as a heading. However, it seems like block rules have different parameters, so simply using the existing functions math or texMath won't work.

It seems that markdown-it-math doesn't have this issue, using the exact technique as described above. See here.

So it seems that fixing this shouldn't be too hard, however as I have zero experience writing markdown-it plugins the way to do this seems quite hard for now.