Fully implement IUnitHandler2

src/common/serialization/vst3.h

@@ -200,7 +200,8 @@ using CallbackRequest = std::variant<Vst3ContextMenuProxy::Destruct,
                                      YaHostApplication::GetName,
                                      YaPlugFrame::ResizeView,
                                      YaUnitHandler::NotifyUnitSelection,
-                                     YaUnitHandler::NotifyProgramListChange>;
+                                     YaUnitHandler::NotifyProgramListChange,
+                                     YaUnitHandler2::NotifyUnitByBusChange>;
 
 template <typename S>
 void serialize(S& s, CallbackRequest& payload) {

src/plugin/bridges/vst3-impls/plugin-proxy.cpp

@@ -450,6 +450,7 @@ tresult PLUGIN_API Vst3PluginProxyImpl::setComponentHandler(
         component_handler_2 = component_handler;
         component_handler_3 = component_handler;
         unit_handler = component_handler;
+        unit_handler_2 = component_handler;
 
         return bridge.send_message(YaEditController::SetComponentHandler{
             .instance_id = instance_id(),

src/plugin/bridges/vst3-impls/plugin-proxy.h

@@ -327,6 +327,7 @@ class Vst3PluginProxyImpl : public Vst3PluginProxy {
     Steinberg::FUnknownPtr<Steinberg::Vst::IComponentHandler3>
         component_handler_3;
     Steinberg::FUnknownPtr<Steinberg::Vst::IUnitHandler> unit_handler;
+    Steinberg::FUnknownPtr<Steinberg::Vst::IUnitHandler2> unit_handler_2;
 
    private:
     Vst3PluginBridge& bridge;

src/plugin/bridges/vst3.cpp

@@ -267,6 +267,12 @@ Vst3PluginBridge::Vst3PluginBridge()
                         .unit_handler->notifyProgramListChange(
                             request.list_id, request.program_index);
                 },
+                [&](const YaUnitHandler2::NotifyUnitByBusChange& request)
+                    -> YaUnitHandler2::NotifyUnitByBusChange::Response {
+                    return plugin_proxies.at(request.owner_instance_id)
+                        .get()
+                        .unit_handler_2->notifyUnitByBusChange();
+                },
             });
     });
 }

src/wine-host/bridges/vst3-impls/component-handler-proxy.cpp

@@ -130,7 +130,6 @@ tresult PLUGIN_API Vst3ComponentHandlerProxyImpl::notifyProgramListChange(
 }
 
 tresult PLUGIN_API Vst3ComponentHandlerProxyImpl::notifyUnitByBusChange() {
-    // TODO: Implement
-    std::cerr << "TODO: IUnitHandler2::notifyUnitSelection()" << std::endl;
-    return Steinberg::kNotImplemented;
+    return bridge.send_message(YaUnitHandler2::NotifyUnitByBusChange{
+        .owner_instance_id = owner_instance_id()});
 }