Texture view leaks regression

[xiaopengli89]

Description
Texture view leaks regression after 8ba5c82

Repro steps

let tex = dev.create_texture(&wgpu::TextureDescriptor {
    label: None,
    size: wgpu::Extent3d {
        width: 200,
        height: 200,
        depth_or_array_layers: 1,
    },
    mip_level_count: 1,
    sample_count: 1,
    dimension: wgpu::TextureDimension::D2,
    format: wgpu::TextureFormat::Rgba8Unorm,
    usage: wgpu::TextureUsages::TEXTURE_BINDING,
    view_formats: &[],
});

loop {
    let _view = tex.create_view(&Default::default());

    que.submit(None);
    dev.poll(wgpu::Maintain::Wait);
    std::thread::sleep(std::time::Duration::from_secs_f32(1. / 60.));
}

Extra materials

[teoxoy]

I don't see how 8ba5c82 would have caused this, the new WeakVec stores only weak refs.

[xiaopengli89]

I don't see how 8ba5c82 would have caused this, the new WeakVec stores only weak refs.

I think it is caused by the implementation of WeakVec, we should set scan_slots_on_next_push = true when empty_slots is empty:

[teoxoy]

Ah yes, that's a good point, empty_slots can be empty after we popped the last element.