Ok, I had a bit of time yesterday to look into it and I now have Qwt's MathML renderer working with QwtTextLabel in a way which is similar to what could be done with the now discontinued QtMmlWidget.

You can find 'my' version of Qwt's MathML renderer at https://github.com/opencor/opencor/t...engines/mathml. I 'cleaned' the code a bit, but nothing major.

I have tried the renderer with some presentation MathML code and it's working fine. At least, as fine as QtMmlWidget. Indeed, I noticed some issues with the renderer itself (see https://github.com/opencor/opencor/issues/225). I will try to fix them when I have a bit more time.