winit crash

Hi :D

I am getting a crash when I try to build the example from readme:

~/source/vello 101 % RUST_BACKTRACE=1 cargo run -p with_winit 
    Finished dev [unoptimized + debuginfo] target(s) in 0.24s
     Running `target/debug/with_winit_bin`
[2023-05-28T13:36:15Z ERROR sctk_adwaita::config] XDG Settings Portal did not return response in time: timeout: 100ms, key: color-scheme
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /home/prokop/source/vello/src/util.rs:58:56
stack backtrace:
   0: rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::panic
   3: core::option::Option<T>::unwrap
             at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/option.rs:942:21
   4: vello::util::RenderContext::create_surface::{{closure}}
             at ./src/util.rs:58:22
   5: pollster::block_on
             at /home/prokop/.cargo/registry/src/github.com-1ecc6299db9ec823/pollster-0.3.0/src/lib.rs:128:15
   6: with_winit::run::{{closure}}
             at ./examples/with_winit/src/lib.rs:424:31
   7: winit::platform_impl::platform::wayland::event_loop::EventLoop<T>::run_return
             at /home/prokop/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.28.6/src/platform_impl/linux/wayland/event_loop/mod.rs:242:9
   8: winit::platform_impl::platform::wayland::event_loop::EventLoop<T>::run
             at /home/prokop/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.28.6/src/platform_impl/linux/wayland/event_loop/mod.rs:223:25
   9: winit::platform_impl::platform::EventLoop<T>::run
             at /home/prokop/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.28.6/src/platform_impl/linux/mod.rs:792:56
  10: winit::event_loop::EventLoop<T>::run
             at /home/prokop/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.28.6/src/event_loop.rs:305:9
  11: with_winit::run
             at ./examples/with_winit/src/lib.rs:125:5
  12: with_winit::main
             at ./examples/with_winit/src/lib.rs:484:13
  13: with_winit_bin::main
             at ./examples/with_winit/src/main.rs:4:5
  14: core::ops::function::FnOnce::call_once
             at /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
warning: queue 0x7f4a7d1f6170 destroyed while proxies still attached:
  xdg_wm_base@20 still attached
  wl_output@14 still attached
  wl_seat@13 still attached
  xdg_activation_v1@12 still attached
  wp_viewporter@11 still attached
  zwp_text_input_manager_v3@10 still attached
  zwp_pointer_constraints_v1@9 still attached
  zwp_relative_pointer_manager_v1@8 still attached
  zxdg_decoration_manager_v1@7 still attached
  wl_subcompositor@6 still attached
  wl_compositor@5 still attached
  wl_shm@4 still attached
  wl_registry@2 still attached
~/source/vello 101 % 

Am I doing something wrong or is this a bug? Thanks for any help! I'm on alpine linux with wayland btw.

Start with src/util.rs at RenderContext::create_surface, where the backtrace reports the unwrap, then inspect the call from examples/with_winit/src/lib.rs around line 424. Reproduce with RUST_BACKTRACE=1 cargo run -p with_winit on Alpine Linux with Wayland and determine why the surface creation value is None. Done means the README example no longer panics in this environment.