This templated helper thing (which arguably should never have been introduced) is not supported with the new material system, as it is inherently tied to the old, OpenGL oriented approach.
Decide what to do. Can it removed in 6.0?
|For Gerrit Dashboard: QTBUG-82988|
|296339,7||Remove QSGSimpleMaterial||dev||qt/qtdeclarative||Status: MERGED||+2||0|
|296344,3||Deprecate QSGSimpleMaterial and QSGSimpleMaterialShader||5.15||qt/qtdeclarative||Status: MERGED||+2||0|