VST3 Host: Update parameter values after plugin requests restart with kParamValuesChanged

modules/juce_audio_processors/format_types/juce_AudioUnitPluginFormat.mm

@@ -1732,7 +1732,6 @@ private:
    #if JUCE_MAC
     void addPropertyChangeListener (AudioUnitPropertyID type) const
     {
-
         AudioUnitEvent event;
         event.mEventType = kAudioUnitEvent_PropertyChange;
         event.mArgument.mProperty.mPropertyID = type;

modules/juce_audio_processors/format_types/juce_VST3PluginFormat.cpp

@@ -328,7 +328,7 @@ struct VST3HostContext  : public Vst::IComponentHandler,  // From VST V3.0.0
         attributeList = new AttributeList (this);
     }
 
-    virtual ~VST3HostContext() override {}
+    ~VST3HostContext() override = default;
 
     JUCE_DECLARE_VST3_COM_REF_METHODS
 
@@ -2883,11 +2883,16 @@ public:
         jassert (editController != nullptr);
 
         warnOnFailureIfImplemented (editController->setComponentState (&stream));
+        resetParameters();
+    }
 
+    void resetParameters()
+    {
         for (auto* parameter : getParameters())
         {
             auto* vst3Param = static_cast<VST3Parameter*> (parameter);
-            vst3Param->setValueWithoutUpdatingProcessor ((float) editController->getParamNormalized (vst3Param->getParamID()));
+            const auto value = (float) editController->getParamNormalized (vst3Param->getParamID());
+            vst3Param->setValueWithoutUpdatingProcessor (value);
         }
     }
 
@@ -3505,6 +3510,9 @@ void VST3HostContext::restartComponentOnMessageThread (int32 flags)
     if (hasFlag (flags, Vst::kMidiCCAssignmentChanged))
         plugin->updateMidiMappings();
 
+    if (hasFlag (flags, Vst::kParamValuesChanged))
+        plugin->resetParameters();
+
     plugin->updateHostDisplay (AudioProcessorListener::ChangeDetails().withProgramChanged (true)
                                                                       .withParameterInfoChanged (true));
 }