This reverts commit 060f63ad56, as it broke the C++ interpreted demo and makes it impossible to implement the demo "fully" in JavaScript and Python.
cc #4777
Large C++ files generated from .slint files can cause link problems with MSVC.
When that happens, MSVC itself suggests /bigobj as remedy.
It's not apparent that there's a downside to using this option, apart from
backwaords binary compatibility - which is not a concern for us.
The discussion at https://developercommunity.visualstudio.com/t/Enable-bigobj-by-default/1031214 suggests that perhaps this
will become the default one day.
To simplify our examples and avoid users running into this, let's enable it by default.
Change Model::row_data to return an Option<T> (rust) or std::optional<T> (c++)
Co-authored-by: Olivier Goffart <olivier@woboq.com>
Co-authored-by: Simon Hausmann <hausmann@gmail.com>
This removes the need to manually register fonts. This is initially
applied to the printer demo, but the other demos and removal of the
public manual registration API will come in follow-up commits.
