User has informed us that he has several application that do work with Qt 5.10/12/13 but on 5.14 they stopped working.

He found out that he needed to add:

QTechnique->graphicsApiFilter()->setMajorVersion(3);
QTechnique->graphicsApiFilter()->setMinorVersion(2);

to his code to make it work.

This was not required before.

Could a warning be added if setMajorVersion() and setMinorVersion() have not been set?

Example project has been added.

FlatColorMaterial.cpp needs to have

  m_flatColorGL3Technique->graphicsApiFilter()->setMajorVersion(3);
  m_flatColorGL3Technique->graphicsApiFilter()->setMinorVersion(2);

in order to work on 5.14