Use heapless instead of a global allocator

[markszente]

Hi,

If I'm correct, the alloc crate is presently used when you implement Platform. It would be cool to use Slint without having to use a global allocator. Fortunately, there is a crate for using such data structures with static memory allocation, called heapless. Would it be possible to implement something like this as a feature flag?

[ogoffart]

Right now Slint uses a global allocator, and it would be a major undertaking to change that.
What is your use case for which you can't have a global allocator?