Olivier Goffart

Thanks for the pull request. The code looks good (appart from the missing `#[cfg(unix)]`). But as the other already said, this is probably not something that should be configured in...

I guess this might be a bug in femto-vg. Here is how it render for me: (left = GL backend, right = Qt backend) 

The backend might not provide itself an event loop. (eg, in the MCU case, the board helper would do instead) Or the user might want to use winit directly instead...

## Split the Rendering trait from the Item visiting trait Currentlly, the ItemRendering knows about the Item. I think it would be better if we made the renderer a kind...

A MVP API for MCU was released with slint 0.3. We still need to make an API that can work with top level windows.

Looks like the clang on the macosx CI still don't support what we need here. So maybe not worth merging?

we could have a ```c++ #if clang #define SIXTYFPS_CONCEPT(X) typename #else #define SIXTYFPS_CONCEPT(X) X #endif ``` and some other tweaks

(it looks like the problem is that the concepts header was only added in libc++ 13

> because the element actually keeps its focus even after being set to invisible There was some change regarding focus in the master branch so this particular issue should be...

> I really need some focused and unfocused callbacks for my project. I guess these focus callbacks would make the most sense for FocusScope rather than every elements. > Also,...