gfx-backend-metal v0.6.0: "window does not have a valid contentView"

[parasyte]

The SDL2 example in pixels used to work with gfx-backend-metal v0.5.6.

Repro:

brew install sdl2
git clone https://github.com/parasyte/pixels.git
cd pixels

# This should work
git checkout 0.1.0
cargo run --release --package minimal-sdl2

# This will fail
git checkout 0.2.0
RUST_BACKTRACE=1 cargo run --release --package minimal-sdl2

Error:

    Finished release [optimized] target(s) in 0.14s
     Running `target/release/minimal-sdl2`
thread 'main' panicked at 'window does not have a valid contentView', /Users/parasyte/.cargo/registry/src/github.com-1ecc6299db9ec823/gfx-backend-metal-0.6.0/src/lib.rs:391:13
stack backtrace:
   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
   1: core::fmt::write
   2: std::io::Write::write_fmt
   3: std::panicking::default_hook::{{closure}}
   4: std::panicking::default_hook
   5: std::panicking::rust_panic_with_hook
   6: std::panicking::begin_panic
   7: gfx_backend_metal::Instance::create_surface_from_nsview
   8: wgpu_core::instance::<impl wgpu_core::hub::Global<G>>::instance_create_surface
   9: minimal_sdl2::main
  10: std::rt::lang_start::{{closure}}
  11: std::rt::lang_start_internal
  12: main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[parasyte]

This might be a duplicate of #3329. It looks like wgpu 0.6.0 no longer does the necessary nsview creation that 0.5.0 did.

[kvark]

Indeed, closing as a dupe