Remove   by default from Latex-Code before processing by Katex?

[q2apro]

I am not sure if I should post it as bug or feature request, so "general":

We have noticed that our editor (also found in other editors like Gmail), sets sometimes   as whitespace, which is not visible frontend (wysiwyg).

Then, Katex preserves this whitespace and the rendering gets an extra whitespace.

See the last 2 which has one whitespace before.

Would it make sense to have Katex (we are using the autorenderer!) remove the   before rendering (or better replace them with real whitespaces)?

Is this already possible with the current version? If yes, how to tell Katex to do that?

[edemaine]

I believe you could fix this with the preProcess option of autorender. See the documentation. Something like preProcess: (math) => math.replace(/ /g, ' ') (or you may need to adjust the search string to be an actual unicode character, or &# escape).

[q2apro]

Thanks for your reply.

I tried:

renderMathInElement(document.body, {
	delimiters: [
		{left: "$$", right: "$$", display: true},
		{left: "\\(", right: "\\)", display: false},
	],
	fleqn: true,
	preProcess: (math) => math.replace(/ /g, ' '),  // NEW
});

but the preProcess seems not to change anything. Maybe the syntax at preProcess is incorrect?

[q2apro]

The problem still persists. If anyone knows a solution or workaround, feel free to let us know. Thanks!

[edemaine]

It sounds like you're getting the actual nonbreaking space character, not the string  ' in your content. Try preProcess: (math) => math.replace(/\xa0/g, ' ')

[q2apro]

It works now. Thanks a lot. 👍