Disable throwOnError in KaTeX to reveal user where is the problem

From KaTeX documentation:

> throwOnError: boolean.  If true, KaTeX will throw a ParseError when
> it encounters an unsupported command.  If false, KaTeX will render
> the unsupported command as text in the color given by errorColor.
> (default: true)

It's better to render the formula and highlight unsupported commands than
just give up and render whole formula as a code; users are confused and
don't know what's wrong.

app/assets/javascripts/render_math.js

@@ -18,7 +18,7 @@ function renderWithKaTeX(elements) {
 
     const display = $this.attr('data-math-style') === 'display';
     try {
-      katex.render($this.text(), mathNode.get(0), { displayMode: display });
+      katex.render($this.text(), mathNode.get(0), { displayMode: display, throwOnError: false });
       mathNode.insertAfter($this);
       $this.remove();
     } catch (err) {

changelogs/unreleased/disable-throwOnError-in-katex.yml

+---
+title: Disable throwOnError in KaTeX to reveal user where is the problem
+merge_request: 16684
+author: Jakub Jirutka
+type: other