Implement IPlugView::checkSizeConstraint()

With this the whole of `IPlugView` and thus also `IEditController` is
implemented.

README.md

@@ -19,7 +19,6 @@ incomplete list of things that still have to be done before this can be used:
   - `IHostApplication::createComponent()`
   - `IConnectionPoint::notify()`, and support for indirectly connecting
     components through message passing proxies
-  - The rest of `IPlugView`
   - `IEditController2`
   - All other mandatory interfaces
   - All other optional interfaces

src/common/logging/vst3.cpp

@@ -333,6 +333,18 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(bool is_host_vst,
+                             const YaPlugView::CheckSizeConstraint& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.owner_instance_id
+                << ": IPlugView::checkSizeConstraint(rect = "
+                   "<ViewRect* with left = "
+                << request.rect.left << ", top = " << request.rect.top
+                << ", right = " << request.rect.right
+                << ", bottom = " << request.rect.bottom << ">)";
+    });
+}
+
 bool Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginBase::Initialize& request) {
     return log_request_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -99,6 +99,7 @@ class Vst3Logger {
     bool log_request(bool is_host_vst, const YaPlugView::OnFocus&);
     bool log_request(bool is_host_vst, const YaPlugView::SetFrame&);
     bool log_request(bool is_host_vst, const YaPlugView::CanResize&);
+    bool log_request(bool is_host_vst, const YaPlugView::CheckSizeConstraint&);
     bool log_request(bool is_host_vst, const YaPluginBase::Initialize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Terminate&);
     bool log_request(bool is_host_vst, const YaPluginFactory::Construct&);

src/common/serialization/vst3.h

@@ -90,6 +90,7 @@ using ControlRequest = std::variant<Vst3PlugViewProxy::Destruct,
                                     YaPlugView::OnFocus,
                                     YaPlugView::SetFrame,
                                     YaPlugView::CanResize,
+                                    YaPlugView::CheckSizeConstraint,
                                     YaPluginBase::Initialize,
                                     YaPluginBase::Terminate,
                                     YaPluginFactory::Construct,

src/common/serialization/vst3/plug-view/plug-view.h

@@ -319,6 +319,25 @@ class YaPlugView : public Steinberg::IPlugView {
     };
 
     virtual tresult PLUGIN_API canResize() override = 0;
+
+    /**
+     * Message to pass through a call to `IPlugView::checkSizeConstraint(rect)`
+     * to the Wine plugin host.
+     */
+    struct CheckSizeConstraint {
+        using Response = UniversalTResult;
+
+        native_size_t owner_instance_id;
+
+        Steinberg::ViewRect rect;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(owner_instance_id);
+            s.object(rect);
+        }
+    };
+
     virtual tresult PLUGIN_API
     checkSizeConstraint(Steinberg::ViewRect* rect) override = 0;
 

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

@@ -145,7 +145,13 @@ tresult PLUGIN_API Vst3PlugViewProxyImpl::canResize() {
 
 tresult PLUGIN_API
 Vst3PlugViewProxyImpl::checkSizeConstraint(Steinberg::ViewRect* rect) {
-    // TODO: Implement
+    if (rect) {
-    bridge.logger.log("TODO: IPlugView::checkSizeConstraint()");
+        return bridge.send_message(YaPlugView::CheckSizeConstraint{
-    return Steinberg::kNotImplemented;
+            .owner_instance_id = owner_instance_id(), .rect = *rect});
+    } else {
+        bridge.logger.log(
+            "WARNING: Null pointer passed to "
+            "'IPlugView::checkSizeConstraint()'");
+        return Steinberg::kInvalidArgument;
+    }
 }

src/wine-host/bridges/vst3.cpp

@@ -425,6 +425,11 @@ void Vst3Bridge::run() {
                 return object_instances[request.owner_instance_id]
                     .plug_view->canResize();
             },
+            [&](YaPlugView::CheckSizeConstraint& request)
+                -> YaPlugView::CheckSizeConstraint::Response {
+                return object_instances[request.owner_instance_id]
+                    .plug_view->checkSizeConstraint(&request.rect);
+            },
             [&](YaPluginBase::Initialize& request)
                 -> YaPluginBase::Initialize::Response {
                 // We'll create a proxy object for the host context passed by