I was doing some refactoring before and was hit by one of the
constructors being magically called when i didn't want that.

Since we don't really on it (was just used in some of the explicit type
conversions) I think it makes sense to enable

And 2 small qt6 clang-tidy fixes because we don't have qt6 on
the clang-tidy CI yet

There's 2 potentially source incompatible changes in the qt frontend,
but i really really hope noone was using the constructors that way