This PR resolves the following compile errors:

$ cargo +nightly build --package gain
    Updating git repository `https://github.com/RustAudio/baseview.git`
   Compiling baseview v0.1.0 (https://github.com/RustAudio/baseview.git?rev=e7a6c661eff90000b5a62d28fb8e1eec3997d2aa#e7a6c661)
   Compiling gain v0.1.0 (/home/jp/proj/rust/iced-baseplug-examples/gain)
error[E0050]: method `update` has 2 parameters but the declaration in trait `iced_baseview::Application::update` has 3
  --> gain/src/ui/mod.rs:59:15
   |
59 |     fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 3 parameters, found 2
   |
   = note: `update` from trait: `fn(&mut Self, &mut WindowQueue, <Self as Application>::Message) -> iced_baseview::Command<<Self as Application>::Message>`

error[E0308]: mismatched types
  --> gain/src/lib.rs:83:21
   |
83 |               window: WindowOpenOptions {
   |  _____________________^
84 | |                 title: String::from("iced-baseplug-examples gain"),
85 | |                 size: Size::new(Self::ui_size().0 as f64, Self::ui_size().1 as f64),
86 | |                 scale: WindowScalePolicy::SystemScaleFactor,
87 | |             },
   | |_____________^ expected struct `baseview::window_open_options::WindowOpenOptions`, found struct `WindowOpenOptions`
   |
   = note: perhaps two different versions of crate `baseview` are being used?

error[E0599]: no method named `unwrap` found for unit type `()` in the current scope
   --> gain/src/lib.rs:105:31
    |
105 |         handle.close_window().unwrap();
    |                               ^^^^^^ method not found in `()`

Some errors have detailed explanations: E0050, E0308, E0599.
For more information about an error, try `rustc --explain E0050`.
error: could not compile `gain` due to 3 previous errors

At time of writing, f6e99e9aa6f5aeb6b721cb05e4d882a51d995909 is the most recent commit on baseview's main branch

I tried cargo +nightly build --package gain --release and got error:

error[E0046]: not all trait items implemented, missing: `ui_param_notify`
  --> gain/src/lib.rs:74:1
   |
74 | impl baseplug::PluginUI for Gain {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `ui_param_notify` in implementation
   |
   = help: implement the missing item: `fn ui_param_notify(_: &<Self as PluginUI>::Handle, _: &'static baseplug::Param<Self, <<Self as Plugin>::Model as Model<Self>>::Smooth>, _: f32) { todo!() }`

error[E0277]: the trait bound `RawWindowHandle: HasRawWindowHandle` is not satisfied
  --> gain/src/lib.rs:91:64
   |
91 |         iced_baseview::IcedWindow::<ui::GainUI>::open_parented(&parent, settings);
   |                                                                ^^^^^^^ the trait `HasRawWindowHandle` is not implemented for `RawWindowHandle`
   |
   = note: required by `IcedWindow::<A>::open_parented`

error: aborting due to 2 previous errors

On opening the plugin GUI a SIGABRT causes the plugin and plugin host to crash.

Debugging this issue a little the crash happens when polling the run_instance within on_frame. It happens on the 2nd time it calls poll. Within this context the actual crash happens with the event loop in run_instance and specificly on handlgin the RuntimeEvent::OnFrame and more percisely the call in the term:

let new_mouse_interaction = compositor.draw(
                        &mut renderer,
                        &mut swap_chain,
                        state.viewport(),
                        state.background_color(),
                        &primitive,
                        &debug.overlay(),
                    );