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While I understand the commercial imperative, it is depressing that nothing new is being contributed to the core Qt (I appreciate there are bug fixes). It doesn't feel like a "difficult decision" but instead what is now normal. I can understand the frustration, but it's simply not true that everything 'new' in Qt is released only under Qt Commercial + GPL3 licenses. Actually the other three new modules in Qt 6.11 - Qt TaskTree, Qt OpenAPI and Qt Labs StyleKit - are made available under Qt Commercial + LGPLv3! And there are also new features in a lot of established Qt modules ... This obviously doesn't help you though if you are interested primarily on Qt CanvasPainter.

@JonB that is correct; our tests compile and run with a C++ 17 only toolchain. But if you use it with a newer C++ standard, then you get some support for new language features (like multi-dimensional subscripts from C++23, or std::ranges). This is possible with QRangeModel(Adapter) as the implementation is mostly inline in the headers.