Vscode-markdown: Can not render the $$...$$ block of KaTex if the first $$ is not the beginning of the line

[BlueHeart0621]

Problem

Can not render the $$...$$ block of KaTex if the first $$ is not the beginning of the line.
For example, if there are words before the first $$

abc $$
a = b
$$ def

it cannot render the math formula.

[Lemmingh]

If I recall correctly, it was by design.

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Personally, allowing to embed display math area inside normal Markdown paragraphs would be extremely dangerous.

From the perspective of rendering, markdown-it-katex would be much more error-prone.

From the perspective of editing, creating TextMate grammars for such syntax is also a bad idea.

I'd recommend you to have a look at

• markdown-it's development guide
• https://github.com/yzhang-gh/vscode-markdown/issues/552#issuecomment-578932184
• John MacFarlane's Beyond Markdown

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If you really need display style math in a paragraph, a nice practice is the \displaystyle command. For example:

The optical path length in such medium is ${ \displaystyle [l] = \sum_{i}^{k}{ n_i l_i } }$.