Handle mutual recursion while loading presets

CHANGELOG.md

@@ -81,6 +81,8 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 - Fixed the VST3 version of _W. A. Production ImPerfect_ from crashing during
   audio setup.
 - Fixed _UVI Plugsound Free_ crashing during initialization.
+- Fixed a rare potential freeze when loading a VST3 plugin preset while the
+  plugin is being resized.
 - Because of the new transport information prefetching, the excessive DSP usage
   in _SWAM Cello_ is now been fixed without requiring any manual compatibility
   options.

src/wine-host/bridges/vst3.cpp

@@ -234,11 +234,12 @@ void Vst3Bridge::run() {
                 -> Vst3PluginProxy::SetState::Response {
                 // We need to run `getState()` from the main thread, so we might
                 // as well do the same thing with `setState()`. See below.
-                return main_context
+                // NOTE: We also try to handle mutual recursion here, in case
-                    .run_in_context<tresult>([&]() {
+                //       this happens during a resize
-                        // This same function is defined in both `IComponent`
+                return do_mutual_recursion_on_gui_thread<tresult>([&]() {
-                        // and `IEditController`, so the host is calling one or
+                    // This same function is defined in both `IComponent` and
-                        // the other
+                    // `IEditController`, so the host is calling one or the
+                    // other
                     if (object_instances[request.instance_id].component) {
                         return object_instances[request.instance_id]
                             .component->setState(&request.state);
@@ -246,8 +247,7 @@ void Vst3Bridge::run() {
                         return object_instances[request.instance_id]
                             .edit_controller->setState(&request.state);
                     }
-                    })
+                });
-                    .get();
             },
             [&](Vst3PluginProxy::GetState& request)
                 -> Vst3PluginProxy::GetState::Response {