Calls to glActiveTexture very slow under 3.1.6

[hgomersall]

There appears to be a regression between 3.1.5 and 3.1.6 that manifests itself in my code in the first instance as calls to glActiveTexture taking a long time to return. This is with a PyQt5 programme in which I render to a QtQuick OpenGL context.

It might not be the only problem - the system falls over before any rendering happens so it's hard to find all possible problems.

Downgrading to 3.1.5 everything works just fine.

Running on Ubuntu 22.04 with Intel graphics.

I'm happy to try things and dig through potential issues to get to the bottom of this.