Fix #134 . Missing current_item reset during reset_changed_item_counts.

[BorisBoutillier]

Reset of the buffer was missing an attribute reset.

Locally unit tested with addition of a despawn/spawn system in 2d/sprite.rs
Tested against my local code using bevy that was failing before.

[karroffel]

Looks good to me, thank you very much for the PR! (I can't merge but I'm sure cart will take a look later)

[Cupnfish]

Reset of the buffer was missing an attribute reset.

Locally unit tested with addition of a despawn/spawn system in 2d/sprite.rs
Tested against my local code using bevy that was failing before.

fn spawn_cube(
    mut commands: Commands,
    mouse_input: Res<Input<MouseButton>>,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
){
    if mouse_input.pressed(MouseButton::Left) {
        commands.spawn(PbrComponents {
            mesh:meshes.add(Mesh::from(shape::Cube {size:0.5})),
            material: materials.add(Color::rgba(0.5, 0.5, 0.5, 0.8).into()),
            translation: Translation::new(0.0, 2.0, 0.0),
            ..Default::default()
        })
        .with(Flyable::default())
        .with(CouldDespawn);
    }
}
fn despawn_cube(
    mut commands: Commands,
    mouse_input:Res<Input<MouseButton>>,
    mut cubes:Query<With<CouldDespawn,Entity>>,
) {
    for cube in &mut cubes.iter() {
        if mouse_input.pressed(MouseButton::Right) {
            commands.despawn(cube);
        }
    }
}

I tested my code and Despawn didn't really crash, but Spawn didn't add Cube properly

[BorisBoutillier]

@YRainbbbb I have added your spawn and despawn system to the 3d/3d_scne.rs example and the spawn and despawn continously work properly after with fix.

[BorisBoutillier]

#135 is similar as #134
@katis code no more crash during despawn but has some missing rendering afterwards, perhaps similarly as @YRainbbbb reported.
The fix is not correct . I'll work on it.