Return LaTeX code (between $...$) instead of images

Hello,

First of all thank you very much for the great plugins. I have been using your CKEditor 3 plugin for years and I'm very satisfied.

I have recently upgraded my forum to a new version that has CKEditor 4 and now have a problem.

I would like the editor to return LaTeX code between instead of images. In version 3, it suffices to replace the following line in plugin.js:

currentEdit.insertHtml('<img src="'+name+'" alt="'+latex+'" align="absmiddle" />');

with this line:

currentEdit.insertHtml('$'+latex+'$');

But in version 4 I don't know how to do that.

Could you please help?

Thank you very much in advance!